I’ve experimented with a few publications. Here’s what I’ve found that works:
1) Make sure your content fits and fills a gap.
2) To keep your numbers high, put your work before a large audience.
3) Publish consistently, at least once a week.
4) Use relevant tags with high numbers.
If you’re doing most of this already, chances are you’re having trouble with #2.
I hope this helps! Let me know if you have questions.