Build Your Muscle Memory
Stick with one sensitivity in order to develop the muscle memory you need to improve your aim in Call of Duty: MW and Warzone.
COD Modern Warfare Gameplay
Muscle memory turns aiming from a task that requires conscious concentration into a reflex. This obviously allows you to hit your targets faster.
The more familiar you are with the required tasks, the faster and natural your hands move to accomplish that task. In essence, you’ve got to wire your muscles up to already know how to move your mouse over the enemy’s head without even thinking about it.
Changing your sensitivity very often results in slowing you down from firing a shot simultaneously since you have to move differently to adapt to sensitivity changes.
Once you’ve got a sensitivity that works, stick with it until you can build muscle memory.