The Hidden Triggers Behind Your Website’s Traffic Plunge—and How to Beat Them Fast

The report will tell you if you accidentally block important pages from being indexed or crawled via robots.txt rules, noindex tags, or faulty canonical tags. These are easy mistakes to make in your SEO plugin settings.

Advanced tools like Screaming Frog and Sitebulb can also help you examine your website for technical problems.
If you find any, reverting your drop in website traffic is mostly a matter of correcting your mistakes, updating and submitting your sitemap, and validating the fixes in Google Search Console.