Just post about things you are interested in. Don't focus on the popularity. If you make good quality posts it will come in time I should think.
Also, on Steemit at least, you should comment and interact with other users. I know that I always follow anyone who comments back and forth with me on my posts. And that makes it more likely that I'll upvote their posts down the road because then they will show up on my feed.
i will try