Your Instagram posts used to reach 20,000 people per week. Over the last week, reach dropped to 3,000. Nothing obvious changed. Similar accounts in your space seem unaffected.
Instagram silently bans hashtags monthly. If you used a recently-banned hashtag, your last 10-20 posts may all be hidden from hashtag discovery. Reach drops 60-90% overnight. Fix: audit your recent hashtag usage against current banned lists, remove offenders, wait 14 days for algorithm to re-rank your account.
You may have pushed automation volumes up recently without realizing. Instagram's risk engine doesn't always block actions outright — sometimes it just suppresses reach as a warning. Fix: pull back automation to 50% of previous volume for 14 days. If reach recovers, you know that was the issue.
Instagram updates reach algorithms every few months. Sometimes entire content categories get deprioritized. Fix: check if competitors in your exact category also saw drops. If yes, it's platform-wide — wait 4-6 weeks for the algorithm to re-stabilize, test different content formats.
If you changed posting cadence dramatically (went from 5 posts/week to 15/week, or vice versa), Instagram's 'normal user' model for your account adjusts, and reach recalibrates. Fix: return to previous cadence for 4 weeks, then evolve gradually if changing is desired.
If you suddenly started posting different content types (Reels after months of only carousels, or pivoting topic), Instagram's recommendation engine doesn't know who to show your content to. Fix: stick to your core pillar for 6 weeks to re-establish algorithmic understanding.
Sudden reach drops have specific causes. The hashtag check is the first diagnosis to run — shadowbans are under-diagnosed and account for a lot of 'sudden' drops.