Control groups(faster reaction)
Tactical map every 10 seconds(greater awareness-this is why most people lose games imo)
Watching and learning from streams.
Have a plan from get go.
And this one was hard to learn:
Do NOT stick to firefights you are not going to win, you'll only bleed while your opponent snowballs, you'll get this sector later.
Can you elaborate on the Tac Map Part?