Yea, I totally understand where you are coming from. Sadly, it's a very subjective experience, so it's hard to to gather information about it from others. The only thing I can give you from personal experience is that it really helps to do something, anything, different from what you usually do.
Play in vastly different tunings that let you rediscover your guitar. For example, Devin Townsend used CGCGCE a lot in the past.
Play on a different guitar, or even a completely different instrument. Hell, I have 2 acoustic guitars with a single broken string on them in my living room. I play stuff on those that I would never come up with on my electric, simply because they force me to not rely on patterns I already know.
It also helps to have a couple of (cheap) instruments lying around your house. A ukulele, a flute, a small synthesizer, you name it. Can be really refreshing to play (and fun if you have friends over).
Play in different rooms, play with other people, amps, effects, etc, etc.
And finally, make sure that when you get a good idea, it doesn't take half an hour to set up for a demo recording! That's an absolute inspiration killer. I have a template of a simple VST amp setup I like in Reaper. All I have to do to lay down a demo is plug in my guitar to my DI, open the template, and press record. I don't care if it sounds fancy, as long as it captures what I have in mind at that exact moment. I also start recording whenever I'm going to jam for a while, just in case I hit gold. If it sucks, I just throw it away.
Hope that helps at least a bit. I know I didn't really answer your original question, but imo that question is too personal to answer directly
Maybe try out a few smaller solid state amps and see if there is something you like, if the volume of the big heads is a problem.