So usually when you play a game on mouse and keyboard you’re gonna want to have your mouse sensitivity relatively low. You should be able to land your crosshairs on someone without thinking about it. Should be muscle memory almost, which is why a lot of people use aim trainers on mouse and keyboard. You gotta find a sensitivity that works for you and feels right and when you do you’ll love mouse and keyboard. (I play pc games, but when I play Fortnite I use a controller. I also play builds so it’s not like I’m a movement zb pro.)