all i can say with promotion is play lots of games and as long as ur winning 50% of them ull get promoted. I was drip drapping games for best part of 6 months and feeling like i was never going to get out and then i took a holiday and hit the ladder hard, was out during that same week . . . yes, prolly 100 games later, but if ur not already subscribed get the GM manuals and literally follow the walkthrough builds and watch the replay which executes them, its just pro, believe me got me to gold in korea
You actually need to win more than 50% - if you only win exactly 50%, your MMR will never change because you're playing at exactly the level you should be!
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