Broken SEO rarely announces itself. Traffic drifts downward, a few key pages disappear from the results, and nobody can point to a single cause. The instinct is to publish more content, but that usually adds volume on top of an unresolved problem. Effective repair work is diagnostic: establish what changed, confirm whether pages can be crawled and indexed, verify that content matches what searchers want, then remove the friction that stops users and crawlers alike. This guide explains how to fix SEO on a website methodically, in the order that isolates root causes fastest.

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Establish What Changed and When

Before fixing anything, build a timeline. Open Search Console and compare periods to identify exactly when impressions and clicks began falling, then determine whether the decline is sitewide or limited to certain templates, sections, or query types. Cross-reference that date against your own change log: a redesign, a platform migration, a plugin update, a robots.txt edit, a hosting move, or a content pruning exercise. Also check whether a broader algorithm update landed around the same time. Distinguishing a self-inflicted technical issue from an algorithmic reassessment determines whether you are fixing plumbing or rebuilding quality.

Confirm Crawling and Indexation First

No other fix matters if pages cannot be found or stored. Review the index coverage report for excluded pages and read the reasons carefully: blocked by robots, marked noindex, redirect errors, server errors, soft errors, duplicates without a selected canonical, or discovered but not yet crawled. Test important URLs directly with the inspection tool to see how the page renders and which canonical the search engine chose. Check your sitemap contains only canonical, indexable URLs and is referenced correctly. A single misplaced noindex tag or disallow rule after a staging deployment is one of the most common causes of sudden traffic collapse.

Repair Redirects, Duplicates, and Canonicals

Migrations and redesigns leave debris. Crawl the site and look for redirect chains, redirect loops, links pointing to old URLs, and pages returning unexpected status codes. Ensure every retired URL redirects with a permanent redirect to the closest equivalent page rather than being dumped on the homepage. Confirm only one version of your site resolves, with all alternatives redirecting to it. Verify canonical tags are self-referencing on unique pages and pointing correctly on duplicates. Address parameter-driven duplication from filters, sorting, tracking codes, and session identifiers, since these can bury your real pages under thousands of variants.

Fix On-Page Fundamentals at Scale

Export every page with its title, meta description, heading structure, and word count, then look for systematic failures. Missing or duplicated titles, templated descriptions, multiple H1 tags, missing headings, and near-empty pages all signal low quality at scale. Rewrite titles so each targets one clear primary query and reads as something a person would click. Restructure content with descriptive subheadings that mirror real questions. Add descriptive alt text to meaningful images. These changes seem small individually but a site with hundreds of weak titles is leaving a large amount of traffic unclaimed.

Deal With Keyword Cannibalisation and Thin Content

Sites that publish for years often end up with several pages targeting the same intent, forcing search engines to choose between them and diluting authority. Group your pages by target query, identify overlaps, then decide for each cluster whether to consolidate into one strong page with redirects, differentiate the angles clearly, or remove pages that serve no purpose. Similarly, audit thin pages: tag archives, near-empty category pages, duplicated location pages, and old announcements. Improve them, consolidate them, or remove them from the index. Fewer, stronger pages consistently outperform a large archive of weak ones.

Match Content to Real Search Intent

Sometimes pages are technically perfect and still fail because they answer the wrong question. Search your target query and study what actually ranks. If the results are comparison pages and yours is a general overview, format is the problem. If the results answer immediately and yours buries the answer under a long preamble, structure is the problem. Rewrite so the primary answer appears early, then expand with the depth serious readers want. Add the subtopics competitors cover and you omit, refresh outdated facts, and remove filler. Intent alignment is often the single largest ranking lever available.

Improve Performance and Core Web Vitals

Slow, unstable pages lose both rankings and revenue. Measure your key templates, then work through the usual causes: oversized uncompressed images, render-blocking scripts and stylesheets, excessive third-party tags, missing image dimensions causing layout shift, unoptimised fonts, and slow server response. Remove unused plugins and scripts before trying to optimise them. Enable caching and compression, and consider a content delivery network for global audiences. Verify improvements on real user data rather than lab tests alone, and confirm mobile performance separately since that is what most of your audience experiences.

Strengthen Internal Links and Authority Signals

Once technical and content issues are resolved, make sure authority flows to the pages that matter. Add contextual internal links from relevant articles to priority pages with varied descriptive anchor text, eliminate orphan pages, and keep important URLs within a few clicks of the homepage. Review your external link profile for toxic or spammy patterns acquired historically, and focus new efforts on genuinely earned mentions through original research, expert commentary, and useful free resources. Coordinating this with your wider digital marketing activity amplifies results, because promotion and search visibility reinforce each other.

Verify Fixes and Build a Monitoring Habit

Document every change with a date so you can attribute movement accurately. Request reindexing for critical pages, then track impressions, average position, indexed page counts, and conversions weekly rather than daily to avoid reacting to noise. Expect meaningful signal within four to eight weeks for most fixes. Set up ongoing monitoring for crawl errors, broken links, performance regressions, and unexpected indexation changes so the next problem is caught early. As search moves toward synthesised answers, structural clarity and factual accuracy become part of routine maintenance, which is the foundation of our GEO services.

Final Thoughts

Fixing website SEO is detective work followed by disciplined execution. Pin down what changed, verify crawling and indexation, clean up redirects and duplicates, repair on-page fundamentals, resolve cannibalisation and thin content, align pages with genuine search intent, and make the site fast and stable. Then reinforce with internal links and monitor continuously. Work in that order and you will find the real cause instead of masking symptoms. If you want an experienced team to run that diagnosis with you, we are here to help.