I want to play comp but have bad aim

I keep telling myself that I’ll play comp once I learn the callouts and just overall get better at the game but let’s be real, ik the callouts I just suck. I don’t understand why my aim is getting progressively worse. When I first started playing a year ago my aim was garbage but then I feel like I got a bit better( better than I thought) now since this summer started it’s only gotten worse y’all at least back then I was getting headshots and more kills. It’s my crosshair placement and movement that I keep fucking up now. I just need a few tips on how fix my aim so I can feel better abt playing comp.