Hey,
I know it sucks to get banned, but were really glad to have you back now. I would love to help out and get those reputation that you worked so hard for, but I'm afraid we have no means of giving them back. The only way of getting reputation again is through interacting and receiving positive reacts from fellow forum members.
Sorry I can't give the best outcome here. I'm sure you'll be able to do this again! Rooting for ya.