Trump's approval rating on 11/2/2020 according to 538: 53% disapprove, 45% approve.
Trump's approval rating on 3/1/2020, which to me would be the last time before the pandemic became serious business: 53% disapprove, 43% approve.
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projects.fivethirtyeight.com
Maybe it's that people who already hated him changed to REALLY hating him? Nope, nothing there either. (Yes, it's Rasmussen and so it's biased, but internal results can be compared to each other)
Strong disapprove as of 3/2/2020: 42%
Strong disapprove as of 11/2/2020: 41%
www.rasmussenreports.com
Considering his approval rating actually went slightly up during that time and his 'strongly disapprove' went slightly down what's your basis for thinking the pandemic cost him the election? The simplest answer is the most likely one - Trump lost because America disliked him and elections are popularity contests. The unpopular guy lost the popularity contest. As he remains unpopular, he's most likely to lose if he tries again.
It baffles me because despite losing badly in 2016 he lucked into the presidency that people think this guy is some sort of political mastermind. He's bad at campaigning! He the popular vote in every contest he ever ran in by millions each time! If a Democrat had the exact same popular vote performance everyone would be talking about how they were the worst campaigner of all time.