Your traffic just dropped 80%.
Don't panic.
OK, panic a little. But then do this:
Step 1: Determine what happened
Check Google Search Console for manual actions. If there's a manual action listed, you know exactly what the problem is.
If not, check if a major algorithm update was released around the same time your traffic dropped. SearchEngineLand and SEO Twitter are your friends here.
If neither? It might be a technical issue. Broken sitemap. Accidental noindex tag. Server problems.
Step 2: Diagnose the cause
Manual penalty for unnatural links: You have spammy backlinks that need to be disavowed.
Manual penalty for thin content: You have pages with little value that need to be improved or removed.
Algorithm update hit: Your site didn't meet the updated quality standards. You need to improve overall quality.
Technical issue: Something broke. Find it and fix it.
Step 3: Fix it
For link penalties:
For content penalties:
For algorithm impacts:
Step 4: Rebuild on a solid foundation
Once you've recovered, don't go back to old habits.
Build a proper SEO system. Cover all your bases. Track everything.
SEO Checkup gives you 113 tasks that keep you on the right side of Google's guidelines. Every single task is proven, legitimate, and effective.
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Recover once. Build properly forever. And learn what black hat tactics to avoid so you never end up here again.