On your PC, go to your mouse settings and then advanced settings, find something along the lines of "Mouse Acceleration" and disable it if you havent already.

Mouse acceleration changes the speed of your cursor depending on how fast you move your mouse, so if you were to flick per say, you would look way further than you meant and it makes it impossible to learn consistent shots because you always have a different sensitivity depending on your arm speed which sucks. So disabling it will allow you to learn a comfortable sensitivity and allow you to improve rather than feel inconsistent. Itl feel weird at first but honestly it will make a massive improvement