For those looking to get better, let me just say that getting into diamond/masters league is easy! You just have to know what is important. And what I mean by that is time management!
People learn the wrong lessons when watching the pros play. Be realistic: you are no pro, you will not be able to do everything with your 60APM. But you can do a lot more than you might think--you just have to know how to spend your time and focus. Trust me, I know. I've beaten plenty of masters league players while playing on a laptop on a touchpad
. No kidding. (Yes, I am ranked masters. Yes, I am Korean--but don't let that discourage you crazy foreigners.)
1. Stop trying to do everything. 50 critical actions per minute will win over 100 detail-oriented micromanaging actions. Does microing your scouting worker cut into your ability to queue workers consistently? Does building creep tumors cut into remembering to build overlords on time? Just don't even bother, then.
2. Three things that are never a waste of your limited time: build workers, build supply, all structures building/researching.
3. Hotkey your unit-producing structures, including worker-builders. Invaluable in making macro easy.
4. Macro is king. I am positive I can win against any diamond-and-below player with zero micro--only clicking attack-move. Not to say this is necessarily what you should do.
When engaging, assess the battle quickly and adjust your MACRO accordingly. At low levels (even low masters), micro has a negligible impact on the game. If you will win the battle handily, rally your buildings to attack and spend your money on units! If you are looking to win immediately, starting an upgrade will not help you. Don't half-ass your strategy. If you will lose, attempt to retreat, and rally your buildings to the position best suited for defense, and prepare defense if it is helpful (e.g. bunkers). If the battle is close, rally your buildings to the battle, queue up a bunch of units, and devote a little time to microing. As the outcome becomes clear, revert to one of the corresponding previous strategies.
#4 is violated so badly. Players especially forget about their macro when engaging. Honestly, decent micro takes about 4-6 mouse clicks (e.g. spread out army) and then you can focus on macro again.
Now get out there and get into masters!