I don't know if those kinds of questions are or should be on topic, but I always, when I read them, want to reply with the following:
Many aspiring writers are very much self-involved and completely unaware of where they are in the world of fiction publishing. They are, to use an analogy, like Donald Trump asking his aides what the START treaty was. Obviously you can be ignorant and still become president, and you certainly become a bestselling author without being widely read, but when you look at bestselling authors (and successful politicians) they usually are members of their community – of Science Fiction writers, for example – and know what goes on in that community. They know who the established publishers are and which authors are up and coming. They know the current trends among their audience and who doesn't get along with whom. Because writing professionally requires an expertise that is no different than the expertise of other professionals and requires you stay on top of current events just like a physician has to know new and better treatments.
So the answer to your and similar questions is always that you need to become part of your community. You need to network and subscribe to publications that cover the news in your genre. For SF, you would read something like Locus and be a member in something like the SFWA. Or you read John Scalzi's blog and become friends with other SF writers from your area.