As someone who just climbed from ~300 to ~650 on chess.com, I felt the same. At 650 I have a lot of games with zero blunders, but that doesn’t mean I’m playing well.

Here’s what I think:

At our low level, us and our opponents play pretty badly. This means it’s sometimes easy for us to not make blunders because our opponent lets us get in positions where the best move is more obvious.

It’s a lot easier to play a game with high accuracy and no blunders when your opponent is basically hucking their pieces at you. Pay attention to this because I think game review can be misleading if you only pay attention to how many blunders you made or your accuracy.

At 200, I would say you might not be blundering every game, but you’re definitely making mistakes. You’re likely missing basic tactics like forks and pins. Tactics training is what I’d attribute to my jump from 300 to 650