1. Play the game more
2. Take breaks when anything's hurting
3. Repeat

You will get better, guaranteed! It's that simple.

-Don't spam retry on the same map over and over again, you'll build bad muscle memory, move on and come back to it another day
-Try out different ways to hold the controllers, default is not the best for everyone
-Play both below your skill range to train accuracy and consistency, and above it to train speed and reading ability, switch it up in your play session