I look at what other artists are doing. I mostly try to find stuff that is within the range that I enjoy looking at, but stuff that might be as far within that range as you can get from what I do well or comfortably.
I roll around in how awesome their stuff is and then I kind of bang my ego up against "why can't you do that" until I try to do that.
When I inevitably do something that is totally
not that, I try to find some lesson or study I can put myself through that might give me half of an idea of what they did and I didn't. At the very least, if nothing else works, I might do a master study.
I wouldn't even know where to start for pointing you though more specifically. I'll be honest I don't know what your current level or range or interests are.
There is this though like you can listen to this while doing other things and it is pretty good advice.