SEO · 8 min read

10 SEO Mistakes That Are Killing Your Google Rankings

Most websites aren’t struggling with Google because of a lack of content. They’re struggling because of fixable mistakes that silently drain ranking potential every single day. Here’s what to stop doing immediately.

1. Ignoring Core Web Vitals

Google’s Core Web Vitals — Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS) — are now official ranking signals. If your site loads slowly, feels sluggish on mobile, or has elements that jump around as the page loads, you’re losing rankings to competitors who’ve optimised for these metrics.

Fix it: Run your site through Google PageSpeed Insights or Search Console’s Core Web Vitals report. Compress images, use a CDN, eliminate render-blocking scripts, and ensure visual stability above the fold.

2. Keyword Cannibalisation

When multiple pages on your site target the same keyword, you’re competing against yourself. Google gets confused about which page to rank, and neither page performs as well as it could. This is one of the most common — and most damaging — SEO mistakes on established websites.

Fix it: Conduct a keyword cannibalisation audit. Merge similar pages, use canonical tags to indicate the preferred version, or differentiate pages by targeting distinct long-tail variations of the keyword.

3. Missing or Weak Title Tags and Meta Descriptions

Title tags are still one of the most powerful on-page SEO signals. A missing, duplicated, or keyword-stuffed title tag sends confusing signals to search engines — and kills your click-through rate. Meta descriptions don’t directly affect rankings, but they dramatically impact CTR, which does.

Fix it: Every page needs a unique, compelling title tag (50–60 characters) that leads with the primary keyword. Write meta descriptions (120–158 characters) that sell the click, not just describe the page.

4. Thin or Duplicate Content

Pages with fewer than 300 words, auto-generated content, or scraped text from other sites signal low quality to Google. The Helpful Content System specifically targets thin, unhelpful content that exists to rank rather than to serve the reader.

Fix it: Audit low-word-count pages. Either bulk them up with genuinely useful information, consolidate them with related pages, or noindex them if they serve a UX purpose but not a content purpose (e.g., tag archives).

5. Neglecting Internal Linking

Internal links pass authority between pages and help Google understand your site’s structure and topical authority. Many sites focus entirely on external link building while ignoring the free PageRank they’re already sitting on.

Fix it: Build topic clusters — link supporting content to pillar pages and vice versa. Use descriptive, keyword-rich anchor text. Ensure no page is more than three clicks from the homepage.

6. Broken Links and 404 Errors

Broken internal and external links create poor user experiences and waste your crawl budget. Google’s crawlers follow your links — if they hit dead ends repeatedly, your site gets crawled less efficiently.

Fix it: Use Screaming Frog or Ahrefs Site Audit to identify broken links regularly. Redirect broken URLs to relevant live pages (301 redirects), not just the homepage.

7. Not Optimising for Search Intent

Ranking for a keyword is only half the battle. If your content doesn’t match what searchers actually want to find — the underlying intent behind the query — you’ll rank briefly, see high bounce rates, and slide back down. Google measures this.

Fix it: Before writing content, analyse the top 5–10 results for your target keyword. What format do they use? What angle? What depth? Model your content to match and exceed the dominant intent pattern.

8. Ignoring Mobile Optimisation

Google uses mobile-first indexing — meaning it primarily uses the mobile version of your site for ranking purposes. If your mobile experience is poor — tiny text, unclickable buttons, unresponsive layouts — your rankings suffer across all devices.

Fix it: Use Google’s Mobile-Friendly Test. Implement responsive design. Ensure tap targets are at least 48x48px. Avoid intrusive interstitials. Test on real devices, not just browser emulators.

9. No Structured Data (Schema Markup)

Structured data helps Google understand your content and can unlock rich results — star ratings, FAQs, how-to steps, products — that dramatically improve click-through rates in the SERPs. Not using it means you’re leaving real estate on the table.

Fix it: Implement relevant schema types for your content: Article, Product, LocalBusiness, FAQ, BreadcrumbList. Test implementation with Google’s Rich Results Test before publishing.

10. Treating SEO as a One-Time Project

This is perhaps the deadliest mistake. SEO is not a launch-and-forget strategy. Algorithm updates, competitor movements, content decay, and shifting search intent mean that sites that stop investing in SEO gradually lose ground — sometimes rapidly after a core update.

Fix it: Build a continuous SEO workflow: monthly content audits, quarterly technical reviews, ongoing link building, and real-time rank monitoring. SEO compounds over time — but only if you keep showing up.

Need an SEO audit for your website? Get in touch with 3rd Unicorn — we’ll find exactly what’s holding your rankings back.