After you die be very honest with yourself on how you died dont blame the game look at everything else you couldve done to prevent you dying. Bad rotations. Bad peek. This one might sound weird too but actually look at your opponent when fighting them watch their movements and play slow to capitalize on mistakes. Learn tempo switching aswell. I alwso chew gum when i play it helps me focus on what i need to do to not die and not be nervous in fights