Two options:
(1) regulate Twitter as a public utility; and/or
(2) develop some sort of a substitute.
Both will take time and effort, but you have to start domewhere.
Turn the USPS into a social media platform.
If Donald Trump simply left Twitter and put out messages exclusively on Gab, Minds, or Parlor, and then forced anyone who wanted access to his messaging to get one of these 1A-promoting social media sources, that would go a YUUUGE way to bucking the social media Ministry of Troof.