Play quality 1v1 for six hours a day. Join the 1v1 ladder at 5 games at once, join the 2v2 ladder with a top player puppeting you for experience and play a few RT ladder matches every day. Try to learn from every loss. After six months you'll be a decent player..
Forbidden knowledge that is probably the worst advice ever... Playing that much aint gonna make you a better player. In fact its nearly impossible to play high quality 1vs1 for 6 hours a day. I stopped playing 5 ladder games at a time because i was mixing up the games. Making more mistakes and less focussed on each game. To become a top player it is most important to keep your amount of games limited and take your time to think on each turn.
Lot of people think its stalling when you dont take your turn right after the turn changed. Sometimes its good to think about the possible options. your first idea is not always the best but it is not possible to think about 30 high quality games at once. Check out the top players of warlight and see how much games they play. None of them(maybe one exception there) will play that much