It seem that being a bigot is the glue that hold the alt-right together then. What would be the opposite of bigotry that could hold the left together?
The only hope for the alt-left would be to reconnect with their original working and middle class constituencies.
That would mean ditching their support of Free Trade and an Imperial American Social Agenda. They would have to repudiate victim ideologies of feminism, homosexuality and racial, religious, ethnic minorities.
They would have to present a moral agenda that reflects the defense of the family and equality in distribution of wealth. That would be the only hope of winning back FDR Democrats.. the one's that Trump robbed them of with his populist, nationalist, moralist platform.
Don't hold your breath. The Democratic Party is now utter beholden these victim's lobbies.. and the ideologies of moral relativism, radical indivdualism, gratuitous licence. That will ultimately hand the 2020 election to Donald Trump. There will have to be a complete revolt by the grass roots of the Dems to overturn the arrogant, intellectual, anti-moralists elites who now control it.
That'll come, but not before its all but destroyed itself, and is foundering on the rocks.