I would see if I could figure out something alongside your field of expertise without operating in it. Write or mentor, discuss traps or see if you can get contracts helping teach disadvantaged/prisoners skills that could be used to get into your field? Find a lawyer and work together with them on the legalities and the bann and write about that? Help other people not get tripped up by what happened to you? Expand to other fields that have similar organizational structures and do the same sort of thing -- write or work out a business that is something more holistic so they cannot say you are in your field.