When the Big O was designed in the 70s by Roger Taillbert it was modeled after his earlier design of Parc des Princes stadium in Paris. I think bringing the big O back to that earlier design but curtaining the upper deck like BC place in Vancouver and Mercedes Benz in Atlanta for MLS would work well.
https://en.parisinfo.com/guided-tour...e-Stadium-Tour
https://www.youtube.com/watch?v=175JXH6N71w
https://www.ibm.com/sports/atlanta-stadium/