Hang,
I took about nine months away from the game. Got tired of it. Burned out. In the meantime, I checked in on the board once in a while, watched as new features were added. Finally, the time came when I said to myself "hm, might be fun to try again." Now I just find the enjoyment doing what I like to do. I might be a GV dweeb for a week. Lately, Ive been really working the 51-B. Or, I might not fly for ten days.
I've decided that not only does the game go in cycles, but individual players do too. There is the thrill of learning and your first kill. Then, as the game gets mastered, the enjoyment of refining your skill. Some go for points, or streaks, or leadership, but eventually the feeling creeps in that you've done and seen it all.
Take a break. For a week, or a month, or longer. When you come back, the game will have changed and you might have a new perspective. It worked for me.