I dunno, man, I've run into similar blocks, myself, in terms of "I've done pretty much everything I've wanted to do in the game".
The problem, as I see it, is that you're a kingmaker. Why would you want to be a pawn (or even a king) when you've done that? If I were you, I'd probably take a break and then think about some entirely new angle that lies completely outside the axis of power that you're experienced with. What I mean is don't do any of the things you've already done. Don't do infiltration. Don't be a kingmaker. Hell, don't make isk (I played Shin heavily as a very active solo pvp pilot for about 3 years, never with more than 10 million isk in the bank. This was far more satisfying to me than anything I've done with her after she started making isk. This worked well for me, it may not for you, your mileage may yadda-yadda).
Of course, conquering WH space sounds fun, too. It just sounds a little too close to what you've already done, is the thing.