This. Write and submit: if you write a story that an editor likes enough to buy, he or she will buy it.
I submitted to F & SF originally because I had a novelette-length story and I couldn't think of anywhere else to send it. That was rejected but came back with a handwritten comment "strong writing, please send more". So I did. And she took that next one - my fourth story sale ever, and my first in the SF/F/H genre.
Another thing to add is that editors like discovering writers. That writer could be you.