Hey I saw your comment and just figured to reply incase you didn’t get an answer yet! Not much has changed since Alex’s response to this forum post* Unfortunately like Alex said, you may have to rollback to play the game. Some also use Bootcamp, Parallels etc! I’ve been successful in running on Shadow PC, bootcamp and parallels. I hope this helps!
https://forums.maplesaga.com/index.php?threads/unable-to-open-on-mac.20362/#post-74294 * post mentioned
I believe Crossover works for Big Sur and Catalina; https://forums.maplesaga.com/index.php?threads/macos-running-maplesaga-using-crossover-mac.20499/