Publishers to consider
Persea Books
https://perseabooks.com/submissions.php
Blue tulip publishing
https://www.bluetulippublishing.com/
Alloy Collaborative
https://alloyentertainment.com/articles/manuscript-submission-programs-729141/
Hydra
Digital imprint of Random House - interested in building brand for new authors.
https://www.randomhousebooks.com/hydra/
Third Flatiron
Themed short stories
https://www.thirdflatiron.com/liveSite/pages/submissions
Cosmic Roots and Eldritch Shores
Short stories, scifi and fantasy
https://cosmicrootsandeldritchshores.com/submissions/
Scifi fairy tales
Retelling of classic fairy tales (not Cinderella or Pygmalion) with scifi theme.
https://www.lyssachiavari.com/books/cs-anthology/
The Shell Game
Anthology of essays (750 to 8k) that borrow from other forms.
https://theshellgameanthology.blogspot.co.uk/
Samhain Publishing
https://www.samhainpublishing.com/static/write
Publish horror and romance
Currently closed to unsolicited submissions