Unfortunately repeated rejections are the rule when trying to find an agent or publisher. Please try not to be too discouraged - it really isn't a reflection of your work's quality, even though it undoubtedly feels hard to take!

Another note on the fear of your work being stolen: Many authors fear this, which is very understandable considering how much work has gone into their book and how hopeful they are for it, but it is not actually a real danger. I have never actually heard of an unpublished work by a new author being plagiarized. And if the extremely improbable happened and - say - a famous fantasy author saw it and grabbed it and published it as their own work, you could easily sue them for a lot of money and become famous in the process. :-)

it seems that makes it of no interest to the fandom crowd

In all honesty, this is the case when it comes to me personally. That's why I haven't volunteered to take a look at it.

There are Goodreads communities that offer feedback groups for this kind of thing - but I am only in a gay romance one that doesn't hlp you. Still, if you look/ask around you might well find something suitable!