scrabOk here's a step-by-step guide
+good shit
I know Scrab mentioned it but really, don't neglect your movement. I kinda realised recently that i have really bad movement even for my mediocre level because I only ever focused on my aim and so even if I can hit shots, I'm not getting into good positions or im taking damage needlessly. The art of scout (and probably other classes) is really in the movement imo. For movement I think MGE is better than DM, especially scout vs soldier,.
Also, as somebody who switched sens a crazy amount of times, it's really true about what scrab said about your dm needing to be second nature. For me, thinking about my sens (and so aim) meant that I wasted so many scrims because I was focusing on if i was hitting shots rather than the actual thought process of the game itself. Of course, changing sens constantly also limited my mechanical improvement which kinda stunted my progression for 2 years or so, so don't do that.