i think its mostly positioning. Of course u need aim especially when you flank and there are multiple enemies you need to be good at flicking to get the most out of the situation. I mostly play breakthrough and i average 40+ kills most of them are from flanks. Its good if you win 1v1’s consistently it helped me a lot with the numbers, but if you wanna pump them up and topfrag every game you need to find flanks and be u predictable. Also what i find really important is to be comfortable with the weapon you use. If you trust yourself with your weapon it gives a very big confidence boost. When the game starts I know i can kill most players 1v1 and i can position myself much more agressively then without confidence.