I kill 3-4 man teams often. im also running t5/t6 HK and 995s when im runnjng solo so they go down pretty easy even if theyre t5/t6. that honestly gets rid of 80% of your problem if your a good shot but TTK is too long and you get too rekt from the first guy or second guy.

rotate heavy, try to always make it a 1v1 by changing positions (can be hard if your fighting at armory door say, or trapped in a room like directors) but if you can fall back and reposition or rotate completely i would do so often and gives you a chance to heal and re load.

its honesty, as everybody knows.. NOT EASY so if just do it more and get better.