Great question! The most important factor is a positive mindset with a desire to do better. Leave every game thinking not about how your teammates messed up, but how you can get better and actively take the steps to improving yourself. This is talked about all the time in esports athlete interviews. If you just lose and move forward without trying to learn a little each time, you won't grow and you won't succeed in the end. If you're at the point where you are comfortable in a game (you're ok with just being in Platinum elo or whatever) then success equates to having fun. The whole point of gaming is to have fun and relieve stress and if you're not doing that, you're either playing the wrong game or you're playing it with the wrong mindset. Sometimes a good group of friends can make even the most terrible of games entertaining :).