For me it's been a process of accepting that I do not need to be playing the 8th string often, just when there's a need for it. Truth is, such a low tuned string to me sounds like a trashy bass/guitar hybrid in most contexts, and actively trying to find use cases for it to justify its existence is exhausting. I'm not Javier, Tosin, Fredrik, or a jazz virtuoso, so I just use it when I think it could sound good in whatever I am playing. Or when I'm playing those people's music. Call me musically narrowminded (and maybe you'd be right) but most things I do don't call for an 8 string, or even a 7 string... which is weird because I've pretty much only played my 8 string the last month and a half I figure if I play the guitar a lot without TRYING to play the 8th string, I'll eventually just end up writing more stuff with it, which has been true so far.