Originally Posted by TheLegacy

there are many reasons why this drop in traffic happens from Google Algorithm Update, Manual Penalty, Crawlability/Indexability Problems, Site Speed Issues, Broken Redirects/Canonicalization, Server Issues/Downtime, HTTPS Issues, Deleting Pages, Content Quality Degradation, Loss of High-Quality Backlinks, Influx of Spammy Backlinks, Competitor Activity, Google Search Console Errors, Changes in Search Demand, keyword stuffing and a few others.

To diagnose the exact cause, you would typically look at your Google Analytics (to pinpoint the exact date of the drop and affected pages) and Google Search Console (for any warnings or changes in indexing status). You may also want to download the server logs to get a more insightful idea as to what may have happened for example surge then drop maybe bots.

I am happy to help for a month if you wish to find the problem and correct it if you wish. NOTE btw there is no set time to trust a website - It's a complex algorithm that evaluates many signals to determine a site's overall quality and authority.