Some popular options for submitting genre short fiction include traditional print publishers like Penguin Random House or HarperCollins, but they have strict submission guidelines. Another option is indie publishing platforms such as Kindle Direct Publishing or Smashwords, which offer more flexibility.
Well, you might consider sending your work to specialized short fiction websites like 'Tor.com' or 'Clarkesworld Magazine'. They have a reputation for featuring quality genre fiction and can give your work good exposure. Also, don't forget to look into local literary journals or competitions in your area for more targeted opportunities.