I had a very similar problem actually: I picked up (from 1635) 135 points in one tournament and after that tournament I had a hard time playing at that level. Here was how I maintained that rating-
start focusing your attention to openings and which is most COMFORTABLE for you to play. This will help suit your style best and allow you to play better games (in many cases)
Study tactics; the less stupid mistakes the better
Analyse all mistakes in the games that you lose, and look for patterns. If a specific idea is what is ruining your games, focus on that EXACT concept.
That is the strategy for maintaining my rating after that 'fantastic' tournament. If you are curious as to my rating changes , my USCF code is 14004907.