There are a lot of on-line magazines that are real publishers. I'm somewhat aware of the science fiction ones, some of which would probably also publish horror.
One to take a look at is Daily Science Fiction. You can subscribe for free. It's a paid market and is a SFWA (Science Fiction and Fantasy Writers of America) qualifying market, which is a big deal in the science fiction world. I expect they'd be open to certain kinds of horror. As you've noticed in horror, there are lots of markets that aren't quite the real thing, and I suppose there's an equivalent of SFWA in the horror world.
I wish you much good luck. I'm a bit of a science fiction writer myself, and I know how tough it can be.
Oh, here's another thing to look at. See if you can find any open anthologies you can submit to.
There are lots and lots of science fiction cons, and probably at least some horror ones. Do some on-line research, and if you find something you can attend, do so. The cons are wonderful in my experience. You get to connect with writers and fans and with any luck at all find good publishing opportunities.
Hang in there. And let us know how you do.
= new reply since forum marked as read