A sudden drop almost always has an identifiable cause — the key is checking the right things in the right order.
Check whether the site is actually accessible, whether pages are returning errors, and whether search engines can still crawl and index it — technical breakage is one of the most common and most fixable causes of a sudden drop.
Search Console (or equivalent) will show if a manual action has been applied — a specific, identifiable cause that requires a specific, known remediation process rather than general guessing.
If the drop coincides closely with a known search engine algorithm update, that's a strong lead worth investigating specifically, rather than assuming an unrelated cause.
A sudden loss of significant backlinks, or a spike in low-quality links pointing to the site, can both affect rankings — checking recent backlink profile changes is a specific, checkable diagnostic step.
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