I'm just wondering if you can actually say this in certain contexts. I thought of this just recently and I thought it sounded strange, mainly because I could only think of one time you'd ever say this.
My idea was that if you wanted to tell someone "Improve yourself!" or "Get better!", then you could also maybe say "Go greater!"
English is my native language, and I don't see a grammatical problem with this statement (besides the lack of a noun, but then again "Get Well!" doesn't have one.) But, I've never heard it before, and I would like to know if anyone else thinks it could be said, and doesn't have some kind of "incorrectness" that I can't see.