September 2023, we migrated from WordPress to a headless CMS. Used a premium migration tool that promised to handle all redirects automatically. Within three weeks, Google's index dropped from 8,900 pages to 2,100 pages. Organic traffic fell 71%.
The migration tool created redirects, but they were chained. Old URL redirected to an intermediate URL, which redirected to the final URL. Google treats redirect chains as soft 404s after a while. We had three-level chains on some URLs. Google gave up following them.
Our XML sitemap wasn't updated properly. It still referenced old URLs, and the new sitemap wasn't submitted to Search Console correctly. Google kept trying to crawl old URLs, hitting redirects, and eventually stopped trying.
**What specific technical errors caused the prolonged recovery time?**We changed URL structure during migration. Went from /blog/post-name to /content/blog/post-name without thinking through implications. The migration tool created redirects, but we didn't update internal links. Every page had dozens of internal links pointing to old URLs, forcing unnecessary redirects.
Our robots.txt accidentally blocked the new URL structure for two weeks. A staging rule that disallowed /content/ went live. Google couldn't access our main content sections during critical re-crawl period.
We also removed old content without implementing 410 status codes. Just deleted pages, which returned 404s. Google kept those URLs in its index for months, showing error pages in search results.
**How did we actually get everything back?**First, we manually audited every single redirect. Found and fixed 340 redirect chains, 127 redirect loops, and 89 orphaned redirects pointing nowhere. Implemented direct 301 redirects from old URLs to new URLs.
We crawled the entire site with Screaming Frog, exported all internal links, and ran a script to update them to new URL structure. Eliminated unnecessary redirects for internal navigation.
Created a comprehensive redirect map and submitted it to Google via Search Console. Requested re-indexing for top 500 pages manually. Recovery took five months total, and we still haven't recovered about 1,200 low-value pages that probably weren't worth migrating anyway.