I’ll tell you what I do. I have two guitars and two basses. I roll a dice when practice time comes and that determines my instrument for the session. I may be splitting my focus, but, crucially, I’m also sticking with both and coming back day after day. There’s a lot of transferable skill and knowledge between the two, so I don’t really see it as lost opportunity cost, especially if I’m hitting a brick wall in one area that I don’t want to keep grinding up against. Tired of repetitive bass octave pain? OK, let’s practice some rhythm guitar for a bit. Bored of that? OK, I think I can handle another run at those bass octaves. Heck, if I don’t want to change it up, I don’t bother with the dice. I’m sure there’s better ways of doing this but the one that works is the one you keep doing, not that I’m any expert. You can do this!
I like this answer, I really shouldn’t choose one or the other, I should choose both.
I don’t understand the problem. You are enjoying yourself, and, you are at your capability limit for guitar. When I played trumpet years ago, I complained to my instructor that I couldn’t play fast, his response, “play slower’.
When I moved to sax this prevented me from running Coltrane like riffs and playing lots of fast jazz stuff - the solution…. make them ballads.
Life is life, don’t fight it, embrace what you love and make peace with what you can’t do.
And follow @Barney ‘s advice - just look at the groupies!!!
Yes yes yes. I wanna make the ballad version of Jaco’s Donna Lee or the Come on come over. It will be fun and relaxing 
55!!! Guess I should give it up since im 53. Play what you enjoy, and have fun. Isn’t that what its about?