Earning Money Online

I know there has to be a really big secret to making a lot of money online because I don't think I have it completely down yet. I do have two part time jobs online, but I'm not making millions or even thousands. I am making hundreds but I would like to make more and use my time better. I read today where someone writes articles 6 hours a day 5 days a week and makes about 5000 dollars a month, so my question is - What the heck am I doing wrong?