I'm not making any claims to know how you get over a slump just throwing the question out there to the community.

I will say however for me:!

Listening to inspirational music
Seperating left and right hand
A new chord progression
imitate your favourite artists
HECK even invent your own new genre
buy some new gear
pick a song you know inside and out

but the most important one for me was make sure you play really quietly >