Social political Reform of U.S

Now that the 45th President of the United States has held what is believed by the great majority of Americans to be the single most powerful office in the world for nineteen months, the majority of that majority now have clear, irrefutable evidence for their substantial and growing anxiety about their personal future as well as the future of the nation.
A large sociopolitical minority continues to support a President whose every domestic and global action has been questioned and challenged on legal, moral, and ethical bases. Voter suppression, gerrymandering, privatization, deregulation, criminalization, and aggressive police actions have all been used as tools to achieve specific goals affecting specific populations.

In the light of what you now know about the reality of conflict and incongruence between the oft-expressed ideals and the actual praxis of the US Constitution by federal and state governments, what single legal/political thing should be the first, foremost, and immediate target for sociopolitical reform?