I think Trump's performance on COVID is the reason why he didn't get more votes, especially the undecided vote. He downplayed the virus, which is out of sync with what we see in the news about people dying (also many of us know people who got really sick or even directly knew of people dying of COVID). For instance, my co-worker's father died from COVID, someone's grandma at church died of COVID, and I know several people who got pretty sick from COVID. Also, he showed no sympathy towards people suffering from COVID, even after getting the virus. If he thinks the virus is no big deal, he should not have taken the heavy drugs (he didn't even take HCQ which he promoted) (people notice small things like this). So, I think it comes down to COVID especially with the undecided or people in the moderate camp. I'm not saying he should have shut down the economy, but if he showed more empathy or stressed wearing masks more, etc., he could have had more votes and he wouldn't be in this situation.