Have you ever improved yourself to the good effectively?
If you think about that question and are honest, the answer is NO.
So, since improving yourself to the good hasn't worked so far, (and it hasn't worked for anyone ever), then the next thought is, "Who can improve me?"
The answer to that one is the God the Bible is all about. So, if you want to improve, seek that one and only God, and let him work you out to good.