The regenerator for me is to notice things I avoid and explore them anyway, then I find the fear they planted to steer me. Then it's a matter of going back to basic principles and seeing if there's any argument for what I've been restricting myself to. A lot of junk ideas are just things you've heard and sounded true, or concluded when you were less experienced. Then it's like a cached web page that's out of date. Clear the cache and reconstruct the idea from scratch.