To save you viability research re: venues where you can promote, and their rules, or at least give you an overview of the ground, have a look at the lists in my kickstarter pdf. Two years old now but I expect you will find the world mostly the same.
Edit- doc direct link https://intfiction.org/uploads/short-url/olIwUy1eln2uigjkXiocjZ3ow8o.pdf
Hosting post:
I have a little more to say (nothing remarkable, I’m afraid) but will wait til I’m at a keyboard.
-Wade