I know it may not make a lot of sense, but try not playing for a while. It seems to work for some people and not work for others - worked for me though. If you play every single day without a break, I think eventually your body and mind kinda get over it. I find if I struggle to play to the best of my abilities or don't find myself improving at all, I just lay down the guitar for a week or so and keep myself busy with something else until I get a strong urge to play again.
Like I said though... this may or may not work for you, but if you're running out of other options, give it a shot. Who knows
