When you play a map, take a recording of a random play every one month.
After a couple of months, when you feel like your bad at playing or you feel like you didn't progress much etc...
Take a look at the recording and ask yourself if your skill has gotten higher. That way you can see what your mistake was in the past, and you could see how much you have progressed along the way. This is of course only my opinion, but try it! ~ The Actor