Let's talk about holding angles! Too many times I see people either exposing themselves to too many angles or lazily standing in front of a corner that people can round, making it 100x easier to be shot.
If you get into the habit of holding a corner at a 30 degree angle or so, you make it way easier to get a kill, and one guaranteed kill instead of taking a 50/50 chance of one (or even worse with prefiring and peeker's advantage) during a clash usually means winning and losing rounds.
I know there is at the very least a couple people who can get better at this, unless everyone here are globals or something.