There appears to be a Google update in progress.

[semrush.com ]

@rajesh112 ... Welcome to Webmasterworld!

The obvious "culprit" is an unannounced update. The reality is that we may never know. At best one can only guess, though we do know that g continually refines the algo to more granularity and less broad results while AT THE SAME TIME shaving off pennies in payouts, eventually creating a new "normal".

Actual Decline (User Behavior Shift)

Clicks and Impressions Decline in Parallel

CTR Decrease

GA4 Organic Traffic Synchronized Drop

Either Rankings Dropped or SERP Click Competition (AI, Featured Snippets, PAA)

Yes, they did tests the last week of january. The way it works, is they roll out an update to quality score checkers first, revamp stuff that gets flagged, then roll it out to the public.

A drop across most keywords like that often means Google recalculated relevance or link signals rather than a technical problem, so check Search Console impressions by page to see if the loss is sitewide or limited to certain sections, then compare the pages that replaced you in the SERP because changes in search intent or stronger internal linking on competitor pages can push results down fast, and also review recent backlink changes since a batch of links losing value or dropping from the index can easily cause a sudden 20 to 50 position fall even when crawling and indexing look normal.