Over on r/Fantasy, they recently ran a poll to rank the top self-published books. It’s admittedly limited to the books read by those who frequent r/Fantasy, but it’s still a handy guide if you’re interested in self-published fantasy fiction: the results.
(I’ve only read a couple so far, but generally I’ve liked them a lot. Right now I’m halfway through Sufficiently Advanced Magic, the first Arcane Ascension novel, and it’s great.)