Step 1: vote out white supremacist
Step 2: primary "centrist" dem 4 years later, assuming he survives the process
Step 3: nominate and elect actual progressive
We don't have a single move solution here, but we have to work the one we have.
The Dems aren't the reason Trump won four years ago, voters not showing up to the voting booths are what got Trump elected four years ago. Those who don't live in swing states don't get a pass as far as I'm concerned.
Anyone who stayed home is complicit, don't care how comfortable the Democratic lead was, my own dumb derriere not returning my absentee ballot last year included.
Side note: the fun thing is that the Black voters of South Carolina are the first block that really helped swing the nomination to Biden.