Try not to think of it as dumbing down! You can write about the growth of the abilities throughout the roleplay. You may find that, as you write, you want to go in a different direction anyway. It's also a blast to see how your character responds to getting stronger. Maybe just lock away the martial arts or the buff for now, and learn them later? I'm not getting the impression that you have to trash these permanently - just that they're too much for now. :)