lazy hand

I have a problem with aiming, particularly with a "lazy" arm. I struggle to keep the crosshair steady and follow the movement of the player during gameplay. Aiming becomes especially difficult with weapons like the Deagle when trying for those one-tap shots. It feels like my arm isn't moving fluidly enough, and I'm not able to track targets properly. I'm wondering if this might be due to not using my whole arm when aiming, or if it's something else I need to improve. Any advice on how to fix this issue?