My aim is really bad like that of a silver. I have gotten to plat from silver without improving my aim at all bc i just have decent game sense but now i cant keep with with plats. How can i improve my aim now?

I main Brimstone and I try every time to lay down a smoke then spray through it with a phantom but I can only ever remember killing someone that way twice in the past 10 games and slightly hitting someone before. It feels like im spraying i...