When the thrill is gone its time to go away for a while.
Come back when the itch gets too bad.
The game hasn't gotten stale, you have. Which is nothing to be ashamed of, it happens to many.
So if your going to stay, change, change everything. What you fly, who you fly with, where you fly, and why you fly.
But it would probably be easier to just walk away for a few months till the urge comes back.
The good news is when you reach this point, your a vet, well almost.