Why doesn't it go faster?

I have a 606.5 MH/s mining rig. but “Expected earnings/day” is 0.01187 ETH(34.13 USD)
This is the same as when it was 540 MH/s before. Could you give me some advice on this case?

are u serious? Just one Link… do some research if u dont understand the basics of mining bro. DIFFICULTY