Yeah, I know I suck

[QuantumApocalypse]

Stick with what you know and improve upon it. Look over replays which you have lost and find why. Did your opponent do something sneaky which you were unaware of? Now you know. Look at other replays, OSN has a great bank of replays nicely categorised for your pleasure. If you are going to do something a bit more risky, try it out in friendly matches. Such things like trying new teams etc.