Unify the cultists into a new, better way of living that still gives their their fix of belonging they so need, while introducing them to fair amounts of reality and personal identity.
Incentivize a crucial standard for any news media, of any political affiliation, to show sources, show margins of error for every statistic displayed, and sticks closer to the actual facts; this will not be a requirement to function, but a standard to show reliability each quarter of the year.
Not only raise taxes on the obscenely rich--if you own more than one house and a boat, you might be considered on the lower end on a case-by-case basis--by a considerable and fair amount, but do something about tax havens and lobbyists.
Bring back a tradition akin to Fireside Chats where the President reads to the American public, maybe once or twice a week. This way show confidence in the leader's ability to do something basic, on one hand, but also give the people something to share with one another.
Make absolutely certain all of these things are given enough time to do what they need to do. A wound does not heal faster if you tear out its stitches, after all.
Somehow I think the hardest part in doing what we need to do is getting enough of the right people to agree to it.
