Write proper super hero stories, while leaving the racism stuff there but mostly in the background, as occasional motivation and general world building.
I don't really know where to begin undoing the damage so I think I would probably just not address it at all until the good new stuff just sort of buried it away. Like, as an example, you can't really UNDO the damage down to Beast but you can ignore it and just write him as his old charming self again and eventually shit will sort itself out.
Also naked Psylocke. LOT'S of naked Psylocke