Some people use alcohol and drugs to enhance their creative faculties which is of course nothing but a big lie our inner dragons tell us in order to keep us from doing our work.
The problem with these artificial enhancements is that you get addicted pretty soon which gets you into downward spiral of unstoppable race to the bottom.
How about unstoppable race to the top instead?
If you want to free your imagination, do this:
Sit down, begin to play and don't stop for 10 minutes no matter what.
Start anywhere. Sooner or later the inspiration will strike.