I’ve tried all these things, too, and I agree with you—they’ve definitely got to add more ways to support new authors.
Perhaps something on the actual app itself would be great. Like you said, there’s that tiny section for the newly published stories in the trending section which features five new stories, but I doubt anyone even goes there. They should make a separate section, and try and add more stories in there.
Also, they had a ‘hidden gems’ section for their weekly topic thing. (Sorry, no idea what its called.) It would be nice if they could make that permanent, and perhaps feature stories read-wise (so say, you have a separate section for stories under 50 reads, 100 reads, 500 reads and so on.)