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A 60% drop right after a migration + sitemap removal usually isn’t just the sitemap, it’s a signal something bigger changed in how Google sees the site.
A few things I’d double check based on similar cases I’ve seen:
* URL structure: did anything at all change with paths, trailing slashes, casing, or parameters? Even small differences can break equity if redirects aren’t perfect.
* Redirects: make sure every old URL is 301 → exact matching new URL, not just homepage or loose matches.
* Indexing: are your key pages actually indexed right now, or slowly falling out? GSC coverage report usually tells the story.
* Internal linking: migrations sometimes mess this up, especially if components changed. Orphaned pages = slow death.
* Vercel setup: seen cases where headers, canonicals, or even accidental noindex tags sneak in depending on env configs.Also, the fact it keeps declining weekly makes me think Google still doesn’t fully trust the current version of the site, not just a one-time hit. That’s usually either redirect gaps or content/structure changes that altered relevance.
If you haven’t yet, I’d crawl the *old version vs current* and compare. That diff often exposes what quietly broke.
