Higher density housing. You can turn parts of the bay into a modern city, with highrises. That way folks won't have to commute to work.

Or you can massively increase transportation capacity, not just with roads but (more effectively) with trains and subways and other forms of fast, efficient public transportation.

Of course none of this will ever happen, SFBA residents and government will continue to exclusively focus on slaughtering their golden geese until they all gone.

Mass transit is what enables population growth, but the numbskulls in the Bay Area decided to have a dozen different transit agencies who all fight like mortal enemies when it comes to even simple things like coordination of schedules. Not to mention the complete incompetence in just improving existing infrastructure like Caltrain and various light rail systems.

You could build up housing density in the places that people work so they wouldn't have to commute.