I go a bit bored a few years back. I trained for and earned my helicopter license, then went for advanced mountain and confined area training.
The result was that flying my C 150 of 24 years ownership, got fun again. It fit like an old shoe, and was wayyyyyy economical by comparison! I can fly the 150 whenever I want, I can't afford to do that in the helicopter!
Try flying different fixed wing types - taildragger, aerobatics, floats. It might spark you!