In the moment im a Smoke main mostly astra but trying to learn omen and ive noticed anything i do in my games i just cant win i cant only win if i make zeeroo Mistakes wich happens rarely to never

So when i start a game, at the beginning i will play carefree and just flow with it and i'll do good, and then as soon as i realize im doing good i start doing worse and worse to the point of not making a frag in 5 rounds, why is this happe...