Quote Originally Posted by Lukie
14) play more hands
15) think about what the hell you're doing
This is the best advice given here. Playing a lot of hands while thinking about your game is the only thing that will really boost your development as a pokerplayer.
Other than that read "Theory of Poker" and "NLHE: Theory & Practice" if you havent already. And also, read all the good threads here on FTR and 2+2 and post a lot hands on these board.