Alfa Romeo I don't think the door is open, this is going to be a young Ferrari driver, Schumacher?
Alpha Tauri I think it's unlikely RB won't want him back
Alpine Does he want to play 2nd fiddle to the crashing Ocon
Haas As Alfa it's a young Ferrari driver, he has no links with Ferrari
McLaren we know he's not there
Williams Possible the only available seat
Formula E I do hope not
GT Racing Possibly
V8 Supercars Possibly
Some form of environmental green racing other than Formula E, not sure what else is out there