Continue to do good work, then you can go for tasks that pay a little more. Once you have a certain number of tasks done and you've got a solid rating, you can up the cash.
But MTurk really isn't a good way to make much. I used it a lot for grad school research, throwing 1000s of repetitive tasks out to people for like 3 cents in order to gather data for our projects. We probably paid $300 for 500 hours of work. The main people we saw using it were security guards and stay at home parents. Unless you just have time to kill and can't do anything more profitable, it won't really get you anywhere.
All that being said, there are different certifications you can earn to get qualified for more difficult but high paying tasks. Prove you speak English well, show you can do math well, etc.
