robin where all teams played more similar schedules. For example, expand to 32 teams and everyone plays a home-and-home against everyone else - so a 62-game regular season. Basically, the soccer model used in most countries.
This would shorten the regular season from the ridiculously-long-and-boring season we’re currently subjected to, and thereby make each game more meaningful. Also, we could give Seattle a team, and some other city too (Kansas City? St Louis? Vegas?).