If I started over again and wanted to make money then I'd pick a topic you really want to be known for. Sort of brand yourself so when the title of your post appears on the wall your a know no entity. The whales as they call them here, are all focused on a specific topic. Then you need to work on getting followers. Post some good comments tent on your topic and engage with posters so they follow you. Good idea to spend time posting on other pages with similar topics. People want a following so they have incentive to follow you back. I've found that if you are willing to write a meaningful post then people are more likely to follow. You also want people who engage to flow you as well. It means they are more likely to post on your content.