Play 1s

I feel like everybody in the community knows this but doesn't accept it. If you wanna improve at the game the fastest way up until about SSL, just play 1s. Yes its annoying and yes you will get mad sometimes, but your rank in 2s will skyrocket as you get better in 1s. Take it from a guy who went from D2 in 2s to C3 very quickly just by getting better at 1s. Even at the highest levels of the game its easy to tell who has played 1s properly before and those are the best players undoubtedly.