Asklemmy

I asked a similar question of a writer friend recently (though I am interested in non-fiction). They told me something that I already knew, but was unhappy to hear nonetheless — that the start of one's writing "career" will inevitably involve a fair bit of writing into the void; even for publications that are accepting open submissions, it's useful to have an established presence so that someone who can read more of your work and get a sense of what you're about. "Established presence" in this case may mean a blog/substance that has little to no readership, even though putting your writing out there when you have zero platform can feel pretty demoralising. It is good practice though, and the more your body of work grows, the easier it is to make a sort of dynamic portfolio of the best of what you can do.

One takeaway from my friend was that a lot of opportunities arise from word-of-mouth interpersonal stuff: when people think of you as a writer, they are more likely to suggest your name to publications that may be looking for writers (which is why having an established presence can be so useful).

I don't have platform specific advice unfortunately.