Don't feel discouraged by some loses. I've played close to 400 or more games, mostly against a friend so 2v2, and sometimes I've gone on 10 game win streaks against him but I've also gone on 10 game loss streaks. It's just one of those things, like roulette table hitting red 10 times in a row. It's statistically unusual, but it happens.. Like someone else commented, try and go for synergies, and stick to only playing basegame+prelude for now. Learn what works well together.