If organic traffic drops by 40% overnight, my first step is to confirm whether the drop is real or caused by a tracking issue. I would check Google Analytics, Google Search Console, and any recent changes to tracking codes or GA4 configurations.
Next, I would analyze the traffic loss by segmenting it based on landing pages, device types, countries, and traffic sources to identify where the decline occurred. Then, I would review Google Search Console for changes in impressions, clicks, CTR, and average positions to determine whether rankings have dropped.
I would also check for technical SEO issues such as robots.txt changes, noindex tags, canonical tag issues, server downtime, crawl errors, redirects, or accidental website updates that may have impacted indexability. If the timing coincides with a Google algorithm update, I would investigate whether the site was affected and compare traffic trends against industry reports.
After that, I would analyze keyword rankings to identify which keywords or pages lost visibility and conduct a competitor analysis to see if competitors gained positions. Finally, I would prioritize findings based on impact, implement fixes, monitor recovery through Search Console and analytics, and provide stakeholders with a clear action plan and timeline.