TL;DR: Level 60, Iron, stand still and shoot, does not crouch, Cypher main and have shaky aim. Play competitive or more unrated?

Context: I'm rank Iron 2, hidden MMR is plastic probably. I play Cypher and Chamber. Cypher more. Level is 60.

So I'm 3 months into the game already and i like it. So far, I have okay experiences but I don't have anything constant. Like, one match goes super well and I top frag while the next match, I instantly bottom frag and lose to the better copy of me on the enemy team which kinda makes me a bit jealous but anyway. I understand no one has a good day all the time but being one tapped is so frustrating because I wanna be as good lol.

So, my crosshair level is fine but I shake when shooting. Like i direct my gun to the enemy's head and fire but then I decide to move my crosshair unknowingly a bit away and die to the one tapper. (And no, I stand still while shooting and I don't crouch)

How do I ensure non shaky aim? This is all that's kinda stopping me from trying competitive again because I dropped from Iron 3 again :"(.

Should I just go and play comp to learn? Or do I play unrated again?. Anyone knows what can I do?