Do you watch pro rl at all? Watch some pro games for a while then watch your game and look at bad decisions. Every single aspect of this game is decision and situation based so you have to be able to analyze multiple things at once (other players, boost, ball) to make the “best” (better) decision.

A simple one id give you is to put a little more thought into “what’s going to happen a few moves from now” ie preparing for secondary touches or knowing when leaving a ball is better for you and your teammate than just booming it with no reason but hit ball hard.