It sounds like you've either lost interest, or else, you need an instrument that especially inspires you. Personally, I find that too much stuff really wears me out. There's nothing like a simple, clean, and minimal set up. But when everything is hooked up, sometimes I'm annoyed even by having to turn on so many pieces in order to sit down and play.
Maybe you do need just one magnificent instrument like the Prophet X, and then to leave it at that.