Why Did My Google Rankings Suddenly Drop｜24 SEO Issues You Should Check

A sudden drop in Google rankings is often caused by content quality failing to meet standards (failing the EEAT standards). Among 24 checkpoints, the primary causes are outdated content (bounce rate exceeding 75%), low originality (indexing rate dropped by 28%), and insufficient depth (dwell time < 15 seconds).

According to Ahrefs 2024 Q2 data, 73% of websites have experienced an unannounced Google ranking decline within the past 6 months, with 41% of cases accompanied by a drop in organic traffic of over 30%—for e-commerce and information sites relying on search traffic, this could mean a daily loss of over 50,000 RMB in orders or advertising revenue.

The following 24 key checkpoints cover over 200 evaluation dimensions focused on by Google’s latest algorithm (August 2025 update).

Website Speed Decline

Image Loading

Test with Google PageSpeed Insights; if the “Optimize Images” item is marked in red, it indicates that images are uncompressed or in inefficient formats.

For example, a food blog’s “Cake Making Steps” original image was a 5000×3000 pixel JPEG (12MB). After compressing it to a 1200×800 pixel WebP format (1.2MB), the loading time was shortened from 3.1 seconds to 0.8 seconds.

Action Recommendations: Use TinyPNG to compress images (keeping EXIF info is optional); embed videos using YouTube/Vimeo (avoid uploading large files directly); set up “Responsive Images” (load different resolutions based on mobile/PC screens).

Server Response

Type ping yourdomain.com in the command line; if the average latency exceeds 200ms (e.g., 250ms), it means the server or CDN node is too far away.

An educational website using a US server had a latency of 300ms for Chinese users. After switching to a Hong Kong CDN, the latency dropped to 80ms, and its mobile ranking improved by 27 positions.

Action Recommendations: Switch to Cloudflare/Alibaba Cloud CDN; contact your hosting provider to upgrade server configurations (e.g., from shared hosting to independent IP);

Clear server cache (use plugins like WP Rocket to clear automatically).

Code Redundancy

Use the Lighthouse tool to check “Unused JavaScript” and “Unused CSS.” If the value exceeds 20% of total resources, there is code redundancy.

An enterprise official website’s homepage loaded 15 CSS files (7 of which were unused). After removing them, the loading time dropped from 2.9 seconds to 1.7 seconds.

Action Recommendations: Merge duplicate CSS/JS files; use “Code Splitting” technology (only load code needed for the current page); remove obsolete plugins (such as unused analytics tools).

Mobile Optimization Failure

Elements Overlapping or Overflowing Screen

Input the URL into Google’s “Mobile-Friendly Test Tool.” If it prompts “Content wider than screen” or “Elements overlapping,” it means a fixed-width layout was used (e.g., setting width: 1200px).

A beauty blog’s mobile page once required horizontal scrolling because the image width was fixed at 1000px, resulting in a test score of only 45 (out of 100). After fixing it, the score reached 82, and the ranking recovered.

Action Recommendations: Use “Responsive Design” (media queries @media (max-width: 768px)); set maximum container width (e.g., max-width: 100%); use width: 100%; height: auto for images to be adaptive.

Fonts/Buttons

A minimum of 16px is recommended for mobile text (18px for small-screen phones), and button sizes should be at least 48x48px (tap target area).

A financial APP’s “Consult Now” button was only 35x35px, with a user click success rate of only 42%. After enlarging it to 48x48px, the click-through rate increased to 67%.

Action Recommendations: Use Chrome DevTools to simulate mobile sizes (Ctrl+Shift+M); check text contrast (text vs. background color ratio should be ≥ 4.5:1); add “Click Feedback” to buttons (e.g., color lightens).

Resource Loading

Mobile networks are slower (average 4G download speed 20Mbps); loading PC-specific resources (e.g., large-scale banner ads) will slow down speed.

A travel website loaded a PC-end carousel (10 images totaling 5MB) on mobile, causing loading time to extend from 1.8 seconds to 4.2 seconds, and mobile ranking dropped by 23 positions.

Action Recommendations: Hide PC-exclusive modules on mobile (using display: none); load lightweight assets (e.g., use SVG icons instead of PNG on mobile); lazy load non-first-screen content (using the loading="lazy" attribute).

Increase in Crawl Errors

404 Errors

Log into Google Search Console, click “Indexing → Coverage → Error.” Red-labeled 404 errors are broken links.

An educational website deleted the “2023 Postgraduate Entrance Exam Materials” page (original link /kaoyan/2023) but didn’t set up a redirect, resulting in 12 external links (e.g., Zhihu answers, forum posts) pointing to a 404 page, and the section’s search traffic fell by 63%.

Action Recommendations: Use “Screaming Frog” to scan the entire site and export a list of 404 links; turn 404 pages into “Friendly Pages” (adding links to related content); perform 301 redirects from old pages to the most relevant new pages (e.g., /kaoyan/2023 → /kaoyan/2024).

500 Errors

Server logs (e.g., Nginx’s error.log) record 500 error causes (e.g., code errors, database connection failure).

An e-commerce site experienced 8-10 occurrences of 500 errors per month due to an outdated payment plugin, preventing corresponding product pages from being crawled and reducing monthly sales by 15%.

Action Recommendations: Contact the hosting provider to view server logs; update plugins/themes to the latest versions; set up “Error Monitoring” (e.g., UptimeRobot) to automatically alert during 500 errors.

301 Errors

Use the “Redirect Checker” tool to input old links. If the redirect exceeds 3 hops (e.g., A → B → C → D) or the target page doesn’t exist, it is a redirect error.

A home furnishing website redirected “/old-sofa” to “/new-sofa-1” (valid), but redirected “/old-chair” to “/old-table” (irrelevant page), causing search rankings for both pages to drop by 40%.

Action Recommendations: Shorten redirect chains (direct A → D); ensure target pages are relevant to the original content; use “rel=”canonical”” tags to unify multi-version links (e.g., PC and mobile versions).

HTTPS Certificate Issues

Since 2023, Google has explicitly made “HTTPS security” a ranking factor. Sites with certificate anomalies (expired, mismatched, mixed content) see an average drop of 28% in mobile Click-Through Rate (CTR) and a 19% reduction in index coverage.

Expired Certificates

Certificates have expiration dates (common 1-2 years). After expiration, browsers display an “Insecure” warning (e.g., Chrome’s ”  This site’s security certificate is expired”).

A maternal and child e-commerce site failed to update its certificate in time, leading 35% of mobile users to close the page immediately, resulting in a 41% plunge in organic traffic that day.

Self-Check Method: Open the site in a browser, click the lock icon to the left of the address bar → View “Certificate” → Confirm if “Expires On” is later than the current date (renewal 30 days in advance is recommended).

Mismatched Certificates

Certificates must be bound to specific domains (e.g., www.xxx.com or xxx.com). If the bound domain doesn’t match the actual site domain (e.g., using a www.xxx.com certificate for m.xxx.com), the browser prompts “Certificate subject invalid.”

An educational sub-site k12.xxx.com failed to load pages normally because the main site certificate didn’t cover the subdomain, losing an average of 200+ consulting users per month.

Solution: Purchase a “Wildcard Certificate” (supporting *.xxx.com) or a multi-domain certificate (supporting xxx.com, m.xxx.com, etc.).

“HTTP Vulnerabilities” on HTTPS Pages

If an HTTPS page loads HTTP resources (e.g., images, JS scripts), the browser marks it as “Partially Insecure.”

A news site once embedded an HTTP external advertisement script on its homepage, causing 70% of mobile users to see an “Insecure” prompt, and search ranking dropped by 22 positions.

Repair Tips: Use Chrome DevTools (F12 → Console) to check for “Mixed Content” warnings; change all resource links from http:// to https://; resources that cannot be modified can be forced to upgrade via the Content-Security-Policy header.

JavaScript/CSS Render Blocking

Google 2024 Core Web Vitals data shows that pages with first-screen loading times exceeding 2.5 seconds due to JS/CSS render blocking lag behind similar pages by an average of 37 positions in mobile rankings.

Simply put: Browsers must first “read” and execute these codes before displaying page content—the more and messier the code, the longer users wait, and the worse the ranking.

The Essence of Render Blocking

When loading a page, the browser processes HTML, CSS, and JS in order by default:

• CSS Render Blocking: The browser must download and parse all CSS (unless marked media="print"), otherwise it cannot determine page styles (e.g., button colors, text positions).
• JS Parse Blocking: JS not marked as async or defer prevents the browser from continuing to parse HTML (fearing JS might modify the page structure), causing content display delays.

A home furnishing e-commerce homepage once loaded 15 JS files (10 of which were not marked as asynchronous), extending first-screen loading time from 1.1s to 3.9s, and mobile bounce rate rose from 51% to 79%.

Which Resources Cause the Most “Traffic Jams”?

Detect with the Lighthouse tool, focusing on three indicators:

Helping Browsers “Load while Displaying”

• CSS: Load only styles needed for the current page: Use “Critical CSS Inlining” (write CSS needed for the first screen directly in the HTML), and mark other CSS as media="screen and (min-width: 768px)" (only load on specific devices).
• JS: Non-essential, No blocking: Add async to non-core JS like analytics and ads (asynchronous loading, does not block parsing); add defer to JS that depends on the DOM (delayed execution, runs after HTML is parsed).
• Compression and Merging: Use Terser to compress JS (remove spaces, comments), use CSSNano to compress CSS; merge multiple small files (e.g., merging ten 10KB JS files into one 100KB file to reduce request counts).

Confusing URL Structure

Google’s 2024 Search Central guidelines state that pages with clear and concise URL structures have a 29% higher indexing success rate and 22% higher Click-Through Rate (CTR) than messy pages.

The URL is the “first clue” for Google to judge page themes and a key factor for users deciding whether to click—messy URLs make robots “get lost” and make users feel “untrustworthy.”

Common Confusion Types

A digital review site once used URLs containing a large number of dynamic parameters (e.g., /review?device=iphone15&date=20240903&author=john), causing different articles on the same product to be identified as “duplicate content.” Index coverage dropped by 24%, and the core keyword “iPhone 15 Review” fell from rank 2 to 11.

What kind of URLs does Google “Like”?

Concise: Ideal length not exceeding 60 characters, for example, /best-laptops-2024 is more readable than /articles/2024/09/best-laptops-for-students-in-2024.

Include Keywords: Use “Product Name + Attribute” combinations (e.g., /wireless-earbuds-noise-cancelling), avoid meaningless numbers (e.g., /post-123).

Static: Use “/” to separate levels (e.g., /category/subcategory/product), use fewer question marks (?) and equals signs (=).

From “Garbled” to “Friendly”

Clean Redundant Parameters: Delete parameters that don’t affect content (e.g., keep utm_source, remove timestamp); use rel="canonical" tags to specify the primary URL (avoiding duplicate content).

Standardize Naming Rules: Use hyphens (-) to separate words (don’t use underscores _); for example, /best-budget-smartphones follows habits better than /best_budget_smartphones.

Unify Case: Use all lowercase (avoid /Product and /product being identified as two pages), and replace special characters (like spaces) with %20 or delete them.

301 Redirect Errors

301 redirection is the signal to tell Google “the new address is here” when a “page moves.” Correct use allows weight to transfer smoothly, while incorrect use causes weight to drain like leaking sand.

Google’s 2023 test data shows that for every hop added to a redirect chain (e.g., A → B → C), the target page’s ranking weight decreases by 15%-20%; if redirected to the wrong page (e.g., old page to irrelevant new page), the original page’s SEO value may drop to zero.

Common Error Types

A maternal and child e-commerce site redirected “/maternity-wear-2022” to “/maternity-wear-2023” (correct), but redirected “/cribs-2021” to “/strollers-2023” (irrelevant page), causing search traffic for both old pages to drop by 55%.

How to Check

Screaming Frog: Scan the site, export “Redirects” report, focus on “Redirect Hops” and “Status Code” (404/500 errors).

Redirect Checker (online tool): Input old links, check the final redirect path (e.g., A → B → C → D), and flag chains exceeding 3 hops.

How to Fix

Shorten the Chain: Redirect old pages directly to the most relevant new page (e.g., A → D, skipping intermediate pages).

Verify Target Page: Ensure target pages exist and content is relevant (e.g., old “2023 Exam Materials” to new “2024 Exam Materials”).

Use 301 instead of 302: Permanently deleted pages must use 301 (temporary adjustments can use 302, but long-term redirects need 301).

Outdated or Invalid Content

Google’s 2024 Core Update clearly emphasized that “content timeliness and accuracy” are core ranking indicators. Outdated content (e.g., 2020 “Latest Phone Recommendations”) has a 35% higher bounce rate and drops 27 positions on average—users need information that “solves problems,” not “historical archives.”

Signs of Outdated Content

A tech blog once published “Top Ten Flagship Phones of 2023,” but in 2024 it failed to update chip and camera parameters, resulting in the article’s ranking dropping from 3 to 18 when searching for “2024 Flagship Phone Recommendations,” and CTR dropped from 12% to 4%.

How to Check

Check Publication Time: See if the end of the content has “Last updated on YYYY-MM-DD”; content older than 1 year needs focused inspection.

Compare with Industry Updates: Follow authoritative agencies (e.g., Bureau of Statistics, Industry Associations) for the latest reports to confirm if data matches.

Read User Comments: Check product reviews on e-commerce platforms or blog comment areas for users pointing out “outdated information” (e.g., “the steps you wrote don’t work anymore”).

How to Modify

Update Key Data: Replace outdated numbers (e.g., “2023” → “2024”), supplement with latest policies (e.g., “2024 Exam Bonus Policies”).

Expand Sub-topics: Add content based on new user needs (e.g., for “Coffee Brewing,” add “How beginners choose beans” and “Effect of different water temperatures”).

Mark Update Instructions: Add a line at the beginning or end of the article: “This article was updated in September 2024, focusing on adjusting the XX section,” to let users and Google know the content is “fresh.”

Insufficient Content Originality

Google’s algorithm essence is “helping users find the most useful content.” Content with insufficient originality (e.g., directly copying encyclopedias, stitching multiple articles) has an indexing rate 28% lower than original content, and user dwell time is 40% shorter—because users can tell at a glance “this isn’t what I wanted.”

From “Copying” to “Rewriting,” all may be penalized

An educational site once took a competitor’s “IELTS Preparation Guide” and only changed the title (e.g., “IELTS vs TOEFL: How Beginners Choose” to “TOEFL vs IELTS: How Beginners Choose”), leaving the rest untouched. This caused the article to be marked as “low-quality duplicate” by Google, with index volume dropping 62% and ranking falling out of the top 50.

Using Tools to “Scan” Originality

Copyscape: Input the article URL to detect if other sites have published identical content (be wary if similarity exceeds 70%).

Google Search: Copy a segment of content (enclosed in quotes) to see if search results show multiple identical pages.

Reading Experience: Read it yourself and ask, “Is this something I could have written?” (stiff splicing and unnatural terminology stacking are signals).

Giving Content “A Human Touch”

Add Personal Experience: Share your actual cases (e.g., “I used this method for IELTS and improved by 1.5 points in 1 month”).

Supplement Exclusive Data: Conduct small-scale surveys (e.g., “Interviewed 100 IELTS candidates and found 70% failed in listening”).

Change Expression Structure: Adjust sentence order (e.g., change “Step 1 → Step 2” to “Do X first, then note Y”), and replace synonyms.

Keyword Stuffing or Deviation

Keywords are “clues” for Google to judge page themes, but excessive stuffing (repeating keywords) or deviation (keywords unrelated to content) causes Google to misjudge “page quality,” and users leave due to poor experience.

Ahrefs 2024 research shows that pages with a keyword density exceeding 8% (normal is 2%-5%) see rankings drop by an average of 29%; pages with keywords mismatched to the core content have a CTR 44% lower than accurate matches.

From “Optimization” to “Cheating”

Typical manifestations of keyword stuffing:

• Title: “Cat Flu Treatment Hospital | Cat Flu Symptoms Hospital | Cat Flu Prevention Hospital” (repeating “Cat Flu” 4 times).
• Body: “Method for treating cat flu, precautions for cat flu treatment, how much does cat flu treatment cost, which cat flu treatment is good” (repeating “cat flu treatment” 6 times in one paragraph).

A pet hospital once had its page marked as “low-quality keyword stuffing” because it high-frequency repeated “cat flu treatment” in the title and body. The page ranking dropped from 3 to 16, and CTR fell from 15% to 6%.

Checking Methods

• Use Ahrefs’ “Keyword Density” tool to analyze page keyword density (be wary if it exceeds 5%).
• Manually read the text and ask: “If I remove the repeated keywords, does the content still flow?” (If not, it’s stuffing).

Solution Suggestions

• Integrate keywords naturally: Place “cat flu treatment” in specific scenarios (e.g., “On the third day of cat flu treatment, the cat starts eating, which is a key sign of recovery”).
• Cover long-tail words: Supplement with “cat flu treatment cost 2024,” “kitten cat flu symptoms,” etc., to disperse keyword density.

Insufficient Content Depth

Google’s 2024 Core Update clearly emphasized that “content utility and completeness” are the core of ranking. Pages with shallow content (few words, fragmented info) have an average user dwell time 58% shorter than deep content, and search ranking drops 31% on average—users need complete information that “solves problems,” not “fragmented answers.”

Signs of Shallow Content

A pet blog once published a “Cat Flu Symptoms” article (only 300 words, listing “vomiting, fever”) without adding “how to distinguish cat flu from a common cold” or “what to do immediately after noticing symptoms.” When searching for “what to do for cat flu symptoms,” the article’s ranking fell from 5 to 23, and CTR dropped from 11% to 3%.

Checking Methods

• Check Word Count: Information-based content should be at least 800 words (guide-type 1500+ words). Use Word or Grammarly for statistics.
• Create Outline: Check if there are “sub-questions” under the core theme (e.g., “Cat Flu Treatment” needs to cover “Symptom Identification → Timing for Vet → Home Care → Cost Reference”).

Solution Suggestions

• Add Specific Details: Change “IV drip” to “usually using Lactated Ringer’s solution (50ml/kg) + antiviral drugs (such as feline interferon).”
• Provide Solutions: Give clear answers to likely user questions (e.g., “Can cat flu be cured?” “How long to recover after treatment?”).
• Mark Update Instructions: Add “Updated Sept 2024, newly added ‘Home Care Practical Steps’ and ‘2024 Latest Treatment Costs'” at the beginning.

Internal Link Structure Errors

Internal links are the “traffic network” between pages—confused structures (no links, chaotic links) prevent Google robots from crawling certain pages, and users cannot find entry points to another article after finishing one.

Screaming Frog 2024 scan data shows that in websites with chaotic internal links, 23% of pages are “orphan pages” (no links pointing to them), and index coverage is 21% lower than normal websites.

The More “Chaotic,” the More Dangerous

A pet hospital’s official website once placed the “Cat Flu Treatment” article in the “Disease Encyclopedia” section, but the homepage and navigation bar had no links to it. This resulted in Google robots crawling it only 2 times in 3 months (normally should be 10+), and the page ranking dropped from 4 to 19.

Checking Methods

• Use Screaming Frog to scan and export the “Internal Links” report, focusing on “Inlinks” (0 means an orphan page) and “Target Page Relevance.”
• Manual Browsing: Click 3 random articles and see if there are related internal links in the body (e.g., does “Cat Flu Treatment” link to “Cat Flu Vaccine”).

Solution Suggestions

• Add “Entries” for core pages: Add links pointing to core pages on the homepage, navigation, and bottom of popular articles (e.g., “Click here to view ‘2024 Complete Cat Flu Treatment Guide'”).
• Link Relevant Content: In the “Cat Flu Treatment” article, link to “How to give cat flu vaccine” when mentioning vaccinations; link to “Dietary precautions after cat flu” when mentioning home care.
• Clean Invalid Links: Delete links pointing to 404 pages (e.g., if the old “2023 Cat Flu Treatment” is deleted, update the link to the 2024 version).

Duplicate Content

Duplicate content refers to the same content being published on multiple URLs (e.g., separate PC and mobile versions) or highly similar content on different pages (e.g., changing a title and republishing). Google treats duplicate content as “low quality,” prioritizing 1 version while others may be penalized—meaning your “efforts” might only count as 1 effective piece of content, and other pages waste indexing opportunities.

The More “Duplicate,” the More Dangerous

A local education website once published “2024 Senior High School Entrance Exam (Zhongkao) Policy” content simultaneously under the paths /zhongkao/2024 and /jy/2024. As a result, Google only indexed the former, causing traffic to the latter to drop by 62%, and the ranking for the core keyword “Beijing Zhongkao Policy” fell from 2nd to 12th.

Check for “Duplicates” with Tools

• Google Search: Enter site:yourdomain.com keyword (e.g., site:xxx.com Zhongkao Policy) to see if multiple pages show the same content.
• Screaming Frog: Scan the entire site and export a “Duplicate Content” report (pages with more than 80% similarity will be flagged).

Make Content “Unique” and “Useful”

• Use rel=”canonical” tags: Add <link rel="canonical" href="Main_Version_URL"> to the HTML header of duplicate pages to tell Google which one is the “master version” (e.g., mobile versions pointing to the PC version).
• Consolidate Content: Delete redundant pages and integrate core information into a single page (e.g., merge “Zhongkao Policy” and “Zhongkao Registration Process” into “2024 Comprehensive Guide to Zhongkao”).
• Differentiated Rewriting: If multiple versions must be kept, add different details (e.g., the PC version focuses on policy interpretation, while the mobile version focuses on “Quick Date Check”).

Meta Tag Failure

Meta Tags (Title, Description) are Google’s “first clue” for determining page topics and are crucial for users deciding whether to click.

Failed meta tags can lead Google to misinterpret content, and users may skip “irrelevant” titles/descriptions—even if the page content is high-quality, it may go unvisited due to poor tagging.

The more “Casual,” the more Dangerous

A local education website once wrote the meta title for its “Zhongkao Policy” page as “Zhongkao Policy 2024|Zhongkao Policy 2024|Zhongkao Policy 2024” (repeated 3 times). This caused Google to truncate the title in search results (displaying only the first 30 characters), and the CTR dropped from 15% to 6%.

Use Tools to “See” Real User Search Results

• Google Search Console: Log in to the backend → “Search Results” → “Titles”/”Descriptions”. Compare if the “Indexed” titles and descriptions match what you set (if they are incomplete or incorrect, the tags have failed).
• SEMrush: Enter the page URL to view the “Meta Tag Analysis” report (flags long/duplicate titles or descriptions without keywords).

Make Tags “Accurate + Attractive”

• Title Optimization: Keep it under 60 characters, including core keywords (e.g., “2024 Beijing Zhongkao Policy: Full Guide to Registration & Bonus Points”).
• Description Optimization: Write a “User Benefit Point” within 200 characters (e.g., “2024 Beijing Zhongkao registration starts Nov 1st. These 3 types of students get bonus points! Click for details”).
• Avoid Stuffing: Integrate keywords naturally (e.g., “Zhongkao Policy” should appear 1-2 times; focus on what users care about like “Registration Time”).

Bounce Rate Surge

Bounce rate is the percentage of users who “directly close” the page after entering.

Google treats a high bounce rate as a signal that the “page is valueless,” leading to a drop in rankings—users vote with their clicks: “This page didn’t solve my problem.”

The more “Mismatched,” the Higher

A local education website once had a “2024 Zhongkao Policy” page that loaded slowly (3.2 seconds for the first screen) and only listed policy clauses (no “How to Prepare” or “FAQs”). This caused the bounce rate to soar from 52% to 81%, and the ranking for core keywords dropped 19 places.

Identify “High Bounce Rate Pages” with Data

• Google Analytics: Backend → “Behavior Flow” → “Site Content” → “Landing Pages”. Filter the “Bounce Rate” column (pages over 70% need urgent investigation).
• Heatmap Tools (e.g., Hotjar): Check the click distribution on the page (if users only click the close button, the content is not engaging).

Make the Page “Solve User Problems”

• Optimize Content Relevance: Check target keywords (e.g., “Zhongkao Policy”) and ensure content covers “sub-questions” users might search for (e.g., “Registration time,” “Bonus conditions,” “Document preparation”).
• Improve Loading Speed: Compress images and clean up redundant code (target first screen load time < 2s).
• Add Interactive Elements: Include FAQ lists, step-by-step diagrams (e.g., “Zhongkao Registration Flowchart”), and comment sections to encourage user engagement.

Shortened Dwell Time

Dwell time is the result of users “voting with their feet”—the shorter the dwell time, the more Google believes the “page has no value.”

Google 2024 Core Web Vitals data shows that pages with dwell times under 15 seconds rank an average of 37 places lower than those over 30 seconds; pages with bounce rates over 70% see a 29% reduction in indexing priority.

Content “Fails to Solve User Problems”

A vocational training school’s official website once had a “UI Design Course” page that only stated “We teach PS, AI, Figma,” without adding “What projects can you do after learning” or “Average salary of graduates.” This caused the average dwell time to drop from 42 seconds to 11 seconds, and the bounce rate soared from 58% to 83%, with the page ranking dropping from 3rd to 18th.

Find Pages that “Can’t Retain Users”

• Google Analytics: Backend → “Behavior Flow” → “Site Content” → “Landing Pages”. Filter the “Avg. Session Duration” column (pages under 15s need investigation).
• Heatmap Tools (e.g., Hotjar): Check the scroll depth (if users leave after only the first 1/3 of the content, the intro isn’t engaging).

Make Content “Valuable and Easy to Read”

Add Details Users Care About: For target keywords (e.g., “UI Design Training”), list sub-questions (e.g., “Can I take freelance orders after learning?” “How long for beginners?”) and answer with specific data (e.g., “80% of students find a job within 3 months, avg salary 12k+”).

Optimize Content Structure: Use subheadings to break up content (e.g., “1. Course Content: Full Workflow from PS to Figma,” “2. Faculty: Industry Mentors with 5+ Years Experience”). Attach cases for each part.

Lower the Reading Threshold: Use list items instead of large blocks of text (e.g., “Course Advantages: ① Many real projects ② 1-on-1 Mentorship ③ Job recommendation”). Bold key content like Job Placement.

Ads/Pop-up Interference

Google 2024 Search Central explicitly warns that pages where “excessive advertising interferes with user experience” will be devalued.

On mobile, pop-ups blocking main content (e.g., “Register for a Red Packet” covering the text) or excessive ads (one every 100 pixels) can lead to a 25% drop in CTR and an average ranking drop of 22 places.

The “More” and “Harder” the Ads, the more Dangerous

A vocational training school website once added 3 full-screen pop-ups to its homepage (users had to click “close” 3 times to see content). This caused the mobile CTR to drop from 14% to 5%, and the ranking for “Beijing UI Design Training” fell 19 places.

Use Tools to “Simulate User Perspective” on Ads

• Google Mobile-Friendly Test: Enter the URL to test “Mobile Friendliness” (if it warns about “Pop-ups blocking content,” ad placement is incorrect).
• Manual Experience: Open the page on mobile and record “How many pop-ups to close before seeing the text” and “Frequency of encountering ads while scrolling” (more than twice needs optimization).

Make Ads “Not Annoying, Not Obstructive”

Comply with Google Pop-up Policies: Mobile pop-ups should trigger after user action (e.g., “After scrolling 3 screens”) and have obvious close buttons (size ≥ 48x48px).

Reduce Ad Quantity: Mobile ads should not exceed 20% of the page content (e.g., only one banner ad at the bottom of an article page).

Match Content Relevance: Priority for education page ads should be “Learning Tools” (e.g., “UI Design Material Site Membership”) rather than unrelated products.

Backlink Loss

Backlinks (other sites linking to you) are “votes” Google uses to evaluate site authority—sites losing more than 10% of backlinks see core keyword rankings drop by an average of 27 places and index coverage drop by 18% (Ahrefs 2024 data).

Links are like a “website’s reputation.” If partners delete links or pages go invalid, Google feels “your site is no longer recognized.”

The more “Passive,” the more Dangerous

A vocational training school once lost links pointing to its “UI Design Course” because a partner “Education Resource Site” revamped. This caused the page ranking to drop from 5th to 20th as backlinks decreased from 87 to 52.

Use Tools to “Track” Backlink Dynamics

• Ahrefs: Enter domain, check “Backlinks” report for “Lost Backlinks,” focusing on “High Authority Sources” (DA ≥ 20).
• Manual Spot Check: Regularly check partner sites (e.g., industry forums) to confirm links still exist.

Keep Links “Unbroken and Authorized”

Proactively Restore Links: Upon discovering a link is invalid, contact the admin (e.g., “Our course page moved to /new-ui-course, please update the link”).

Alternative Link Supplement: If the original partner cannot restore it, find similar sites to re-acquire links.

Clean Up Invalid Links: Delete backlinks pointing to 404 pages or contact the source to remove links if the target page is gone.

Core Algorithm Update Impact

Google performs 2-3 Core Algorithm Updates annually (e.g., 2024 Helpful Content Update).

Every update adjusts “Page Quality” evaluation dimensions—it might prioritize dwell time, devalue low-quality backlinks, or strengthen mobile experience priority.

From “Technical Metrics” to “User Value”

A digital review site once saw its “2023 Flagship Phone Recommendations” drop from 3rd to 18th in 2024 after the Helpful Content Update because it only listed specs without “Newbie buying advice” or “Real battery tests.”

Track Updates and Adjust Strategies

• Read Official Announcements: Google Search Central Blog provides previews of update directions.
• Check Ranking Fluctuations: Use Ahrefs “Algorithm Updates” tool to compare rankings before and after updates.
• Fix Weak Points: If the update emphasizes “User Value,” add “Practical Steps” and “FAQs.”

Increased Keyword Competition

Keyword competition is dynamic—new sites enter, old rivals optimize, and industry heat rises, pushing your “core words” back.

Ahrefs 2024 data shows Top 3 keyword competition intensity grows 18% annually; original Top 1 page content length increased by 35% and backlinks by 50% on average.

From “Quantity” to “Quality”

An e-commerce site held 1st place for “Wireless Headphone Recommendations” for a long time (800 words, 50 links). In 2024, a new competitor released 2000-word content with “Noise cancellation test data” and 200 industry links, causing the original Top 1 to drop to 5th.

Differentiate and Strengthen Advantages

• Find “Long-tail Keywords”: Avoid generic terms like “Wireless Headphones” and target “Noise canceling wireless headphones for students.”
• Add “Exclusive Content”: Conduct user surveys competitors don’t have (e.g., “Interviewing 50 users on 3 pitfalls”).
• Switch “Backlink Channels”: Move from low-authority forums to industry authority platforms (DR ≥ 70).

Search Intent Changes

Search intent is the user’s “true need”—it could be “Information” (How it works), “Transaction” (Recommendations 2024), or “Solution” (How to fix).

Google 2024 research shows 62% of search intent has changed in 2 years: users shifted from “Finding info” to “Finding solutions.”

From “Broad” to “Specific,” Information to Action

A coffee training site saw its “Latte Art for Beginners” rank drop 27 places because users shifted intent to “Common Latte Art Failures,” which the original page didn’t address.

Insight into Intent, Content Adjustment

• Check “Related Searches”: View signals at the bottom of the Google results page.
• Analyze “People also ask”: These reflect deep user needs.
• Restructure Content: Split “Beginner Guides” into “Steps,” “FAQs,” and “Advanced Tips.”

Website Hacked

Hacking is the “Security Red Line”—Hacked sites are marked as “Insecure” by Google (Address bar shows “⚠️ This site may be hacked”).

User click intent (CTR) drops by 41%, and index coverage decreases by 22% (Google 2024 Security Report).

Common Forms of Attacks

An outdoor gear site was hacked through a server vulnerability, and a gambling pop-up was inserted. Google detected it, marked the site insecure, and the ranking for core keywords dropped from 3rd to 19th.

Scan for Security Risks with Tools

• Sucuri SiteCheck: Enter URL to detect malicious code or blacklists.
• Google Search Console: Check the “Security Issues” report for “Site Hacked” alerts.

Fast Recovery of “Safe Status”

• Clean Malicious Code: Restore the site from a clean backup or manually delete suspicious PHP files.
• Fix Vulnerabilities: Update CMS (WordPress), plugins, and change default ports.
• Apply to Remove Marking: Submit a “Security Audit” via Google Search Console after cleaning.

Structured Data Errors

Structured data (JSON-LD) acts as a “translator” for the site—it tells Google “what this content is” (Article, Product, Event) to show Rich Snippets (Ratings, Price).

Ahrefs 2024 data shows pages with correct structured data have a 40% higher Rich Result display rate and 28% higher CTR.

Types of Structured Data Errors

Verify Tag Validity with Tools

• Google Structured Data Testing Tool: Check for “Errors” and “Missing Attributes.”
• Schema Markup Validator: Check if tag types comply with official standards.

Make Data “Accurate + Complete”

Follow Guides: Refer to Google’s Structured Data Guidelines to ensure types and attributes are correct. Fill in key info like Price, Stock, Rating, and Reading Time. Test before deploying.

Seasonal/Periodic Fluctuations

Seasonal fluctuations are “Natural Laws”—demand for certain products/services changes with seasons, holidays, or policies (e.g., winter gear peaks in November).

Demand “Rises and Falls,” Rankings “Fluctuate in Sync”

Predict Fluctuations with Data

• Google Trends: View “Annual Trends” for keywords.
• Historical Comparison: Analyze traffic/ranking changes from the same period over the last 3 years.

Adapt to Cycles Early

• Content Pre-updates: Publish seasonal content 1-2 months in advance.
• Keyword Adjustments: Add seasonal keywords like “Winter” or “2024 New Style.”
• Repurpose Historical Content: Adjust non-seasonal content into “Universal Versions.”

Those sudden ranking drops are rarely because “Google is suddenly targeting you.”

Closing Note: SEO is not about “chasing algorithms,” but “creating value for users.”