You need to post BEFORE you can build an audience. It takes time and effort. People can hardly judge your writing skills, and the quality of content, unless they have read some of your work.
Different communities are developing in response to different interests. Just post something that you found interesting enough to be worth writing about. Or post some of your own artwork, be it paintings, photography, ceramics or whatever. Work on building credibility amongst readers. You will build an audience that way. Forget trying to game the system. In the end the only thing that will bring success and self-esteem is producing quality content.
ColdMonkey mines Gridcoin through generating BOINC computations for science...