Oh yeah, you have a long way to go!
Hmmm a first recommendation that I can give you is, sell the duplicated miners. Because the "Bonus %" only works with unique miners.
Lets say, you have the same 3 miners with 1% Bonus. You might assume that's 3%. Nope, that's only 1%. That's how the system works.

Another tip I can give you is trying to save some RLT. Don't spend it on miners. The best investment are Events. See Roller as a long long term project too.

Hmmm you should join my server. Maybe there you can get some more advice.
We speak spanish, though. But I can make an english channel too!