It's very hard to make any kind of judgement from looking at the material on YouTube, because so much depends on how you relate to an audience, how you would structure a concert set and what kind of venues you're thinking of approaching. All you can do is get yourself out there, get as many gigs as you can in the diary and then see if you can afford to give up the day job.
Oh - and be very careful with any Tolkien-related material in a commercial way because the Tolkien estate doesn't look favourably on any use of material that might be construed as breech of copyright! If it's entirely your composition you'll probably be OK, but if you're quoting from text you probably won't be. I tried to get permission to record my musical setting of one of his poems and met a total blank wall, hence my comment!

Anne