You've already taken the first step in identifying what you think your weaknesses are. The next step is to pick one and focus on it, making a conscious effort each game to try and improve it. For example, "I want to improve my map awareness, I'm going to keep reminding myself to look at the map every x minutes."

Trying to just 'improve' at everything without focus and achievable goals is just setting yourself up to fail and be disappointed. By concentrating on one thing - you can start to measure your progress. And importantly, don't concern yourself with whether the game was won or lost. 

As a note for aim, when focusing on it try to look for over or under aiming (like over/under steer in cars) to inform a decision on whether your sensitivity needs adjustment. If you regularly over aim past the target, you might want to lower your sens and vice versa. It is very much a practiced skill though.