be a coward
practice your aim and get a good config before anything
I used to go 4-20 my first few games then I actually practiced my ak and AWP shot offline and also setup my config to reduce sensitivity fix mouse settings and get a better crosshair
Two games ago I went 33-5 and I continuously do pretty well.. but really it's up to you to improve.
also last game I was doing horrible (I went 0-8 first half) and we were getting destroyed 1-7, started getting my act together and we won 16-10 and I went 22-14 lol