The pattern shift at month 6 usually happens when users move from exploring features to actually relying on your app for real problems.
I track what specific actions these long term users take differently and then test promoting those behaviors earlier in the funnel. Sometimes the features that hook people long term are buried or not obvious to new users.
Users past 90 days understand your app’s core value differently than early metrics show. They integrate it into their daily habits. What you’re observing at month 6 is likely them discovering new use cases or situations where your app provides more value. Segment these long-term users and analyze what triggers these shifts. That’s where you find true product market fit.