It should have a reason for your ban when you try to join back, and applications are closed at the moment. If you still cannot find your ban reason, could you just give me your discord tag? I can look it up for you. If you would like to appeal for it, appeal for it in the ban appeals section.
You don’t start getting money really fast until C or D mine. For a B miner, the best way to make money is to sell crystals and smelt all that you mine.
Once you get to C mine you will start to see a difference in how much money you will be making.