How do you guys prep opponents outside the opening?

I've asked a few questions on this sub recently, but I'll give the same context. I'm a recent CM (young teen) looking to improve my game, around 2600 Lichess taking it semi-seriously.

I've always prepped my opponent's opening well and many people have complemented my regular advantage out of my prep. But, I've been told by parents and other people I burn too much time on opening prep (my eternal sin!).

The only other thing I do is to look at which structures the prepped line would lead to and read my file on how to play that particular structure. (I created them from Johan Hellsten's Every Pawn Structure Explained video course on Chess.com, which helped a lot for a Gen-Z short attention span person such as myself!!)

I know some people use the Tactical Report or Dossier feature on ChessBase 18, which I have, but I've never thought much of the AI-generated opponent summary and think it's just #AISlop.

So, How do you guys prep your opponents outside of the opening?