I think you would do well in the current moveed up 4.0 levels, adult tennis, especially in hitting, speed, and movement. Tactics, match play,gamesmanship, might favor older, more experienced 4.0's.
You just need to hit a few thousand more backhands. 3 months is little time to adopt something new.
Notice your forehands are short direct prep, while your 1hbh is a long looping stroke that might require more timing. Nothing wrong, just be aware of this.
You turn over on the followthru like some top players, while other top players followthru old school open faced. Just remember and replicate the shots you do well, and try to isolate and eliminate the form that hits wild balls.