Personally, I'd like to see the season shortened (in # of games) to give each game a more outsized impact. Give teams a bit more rest to enable shorter rotations (star pitchers get more game time) and expand the playoffs slightly (via play-in games) to lessen the soul crushing nature of missing the playoffs by a single game after a grueling 162 game season. Not that any of these ideas are novel or perfect, but it's clear baseball has engagement issues that are not improving any time soon.