Trump didn't have to be nice and polite, he just had to operate with any bit of restraint in how and when he was mean and impolite, which he didn't.
I don't think outreach to those demographics is a lost cause (Trump managed it, after all). And Biden doesn't have the votes for amnesty.
The fact that dominion is sueing undermines the idea that systemic tampering occured. If it had, they wouldn't have dared sue, becuase as part the trial, they would have to go through discovery and hand their critics the ability to go digging for evidence of fraud. The fact that thier critics have constantly backed down when threatened with legal action only further proves that they never had any evidence dominion was guilty either.
The democrats don't have the votes to pass any of those things, most certainly not abolishing the EC.
And those blatantly partisan actions only undermine those corporation's appeal and credibility among independent and moderate voters, who are far more numerous than the partisans of either side. It's not going to be a cakewalk going against them, no, but it's entirely feasible.
Which will again gut thier credibility, and position a GOP that's able to capitalize on Trump's gains with minority voters to make inroads into those same cities.
If he does that, which he won't because, again, he doesn't have the votes for it, he starts a civil war, one that his side cannot win.