I'm in the same boat, I've been itching to upgrade my 6600k, but just don't have a need.
I think a ryzen 4600x or 4700x may be in my future with next gen consoles near release.
Im going 4700x for sure. With the consoles being 8 core 16 thread that seems to be the way to go. At least you can still get a decent amount for your 6600k on the used market to help cover a little of the upgrade cost.