Haven't posted one of these in a while. As usual, it's a mixed bag with some interesting ideas. There's one entirely themed around merfolk (mermaids and kindred beings). Another is looking for poetry inspired by Frankenstein. Stories told from a dragon's point of view (Anna?). And much more. I'll look them over as usual to see if anything clicks. Maybe you should, too. A few do have fairly close deadlines (October 15 in a few cases), others are end of year or similarly longer periods.
https://authorspublish.com/37-themed-submission-calls-for-writers-for-october-2022/