Stuck in a rut...

You need to broaden your scope. For instance, lets say your main musical interest was acoustic rock, which has become boring and routine, then maybe opting for an elective study would be of interest and use. Try divulging into the world of bluegrass or country blues, no?, maybe flemenco?

Sometimes a brief change is all that is needed to revitalize ones main interest and hobby. After all, you can always take you current body of knowledge and fuse it with what ever elective guitar path you choose and have a new sound and new ideas to toy with.

I bet you could go to your local library and find an interesting guitar book in a style of music new to you or one of lesser interest and rekindle the flame. It'll cost you nothing to. Thats my advice.