Vote for the change you want to see.
The Republican party got remade because trumpists showed up and outvoted the party elites. No reason it can’t happen for the Left except for laziness and apathy.
If all the progressives furious about the state of affairs now had shown up for Sanders in 2016, I doubt we’d be in this hellish timeline. Sadly, he needed the young progressive vote to show up.
I doubt it would have made a difference. DWS would have ratfucked it for Hilary even if Bernie got more votes. Nobody ever remembers the unpledged delegates which are about 20% of the total and don’t have to follow the will of the voters.