What helped you guys to improve?

Hey everyone! I hope you are all doing well :D

I have around 140 hours in CoD, so I'm not really new, but not really experienced either. When playing against other people, I always feel like I'm a lot worse than everyone else.

My reaction time is awful, my aim is awful, pretty much everything I do is awful xD

I know things get better with practice, but I'd also love to know if there were certain things that helped you to improve at CoD? Or were there any things that improved your gameplay when you stopped doing them?

I for example should probably stop running around so much and start taking things more slowly :,D In every game I see people running, jumping and sliding around while still being able to hit every shot. I wonder how people are able to aim and play that well, it's super impressive.

(Also for people who play with Keyboard and mouse; what mouse sensitivity and settings do you feel most comfortable with in Black Ops 6? I'm not sure if I've found the correct sensitivity for myself yet :D)

I'd deeply appreciate it if you could share your experiences! Thank you in advance, I wish you all a wonderful day!

(Edit: Spelling)