I don't think Trump's behaviors and actions have changed many minds. He is what he is, and he's pretty much been Trump through this whole thing: Bullshitting us early and often, then going socialist when the chips are down.
So I think the two variables as far as the electorate is concerned could be (a) whether Biden and whomever he picks as his female, PC-approved veep are at all attractive, and (b) will any voters vote for Trump for the sake of continuity through this virus thing.
Trump should be easily beatable, but the Democrats can't produce a decent alternative. Again.
And we'll have a lousy choice. Again.
In all fairness, Biden could put in a team and clear off and play golf for 4 years and he would be better than Trump.
Trump's biggest weakness is that he can't get enough competent people to work for him. The reason is they know that Trump seems unwilling or unable to delegate authority to them. Everytime a person is announced for the WH, we just goto Wiki to see what in there past makes them unsuitable for the top job.