Have you lost your "moho"? It happens, sometimes more frenquently than we would like.
When it happens to me... I just not push over, I do not force anything. I just leave the hobby in stand by.
Ususally a book or a film drives me to Total War series, then it leads to Warmaster and then I quiclky forget the pixels and take the brushes.
If your lack of energies is about fantasy but not the hobby you could focus in history, warmaster ancients or other wargames like Bloody Big Battles, On the Seven Seas (if you want pirates), De Dux Bellorum, Heroclix for superheros, Future War Commander, X-wing, or whatever.
hope it helps