Originally posted by Patanjali
So my best coarse of action is to review past games to see where I went wrong?
It is essential that you review your games. In my opinion not reviewing them is why you're not improving. Review them with a better player if possible and if not then review them yourself.
Years ago I taught for a test preparation company. Students thought the best way to prepare was to take every practice test we offered. We encouraged them to take less tests, but do a thorough review of the ones they did take. The way we explained the difference was this:
"When you take a test, all you're doing is demonstrating what you already know. When you review a test, you are learning." The same applies to your chess games. Simply playing teaches you little. Reviewing teaches you a lot.
Beyond that, the suggestions of others that you learn endgames or tactics is helpful and a never-ending quest, but how do you know what to study first? Until you review your games you won't know if you're losing more games to missed tactics or to botched endgames.