To get more earnings from your post, you need to publish articles of value and interest to the Steemit community. Now, that is a very general suggestion. But take a look at categories people tend to upvote.

You also need to be consistent with your topics and regular postings so that people who follow you get regular feeds from you. This is easier said than done but that's how you earn here. Plus, you need to be more patient than usual. Do more research on popular topics. I hope this helps. Cheers!