Sudden view drops usually have a boring cause. You posted less, your hooks got weaker, you reused old audio or you posted something the system flagged. Check insights for when it started, go back to the format that worked, post consistently for two weeks and avoid reposting watermarked content. One slow week is normal, a month is a pattern to fix.
How to diagnose the dip
Most drops trace to a change you can name. Find it first.
Check when it started
Line the dip up against what changed in your posting.
Common causes
Less posting, weak hooks, recycled audio, watermarked reposts.
How to recover
Return to your best format and post steadily for two weeks.