Usertesting tips?

With the August earning report just coming out, I was seeing that people were making $100+ on Usertesting. I've been with them a few years, and I think my highest payout for a month was like $70.

How do you guys get so many tests? Is it just closely monitoring the tests and doing them quickly? Or are there ways to know what they're looking for, and cater to it a bit more?

I'm a 4.5 star tester, and I always have the website open on my computer.