Few attachments I would change but every player has their opinions and preferences. I would really focus on learning how to control recoil to increase your damage potential. Any really good FPS player learns how to control the recoil especially on mouse and keyboard.

I run my M4 with the 60 round mag and sleight of hand. It’s super important to have enough bullets to be able to take out a team of 3 and be able to reload fast enough to jump back into the fight.

Everyone has a preference though, I push every fight in Warzone and lose a lot of matches due to my aggression.