Biden faults the pandemic for not campaigning out in person, but it's worth remembering that his travel schedule was remarkably light even during the primary. He would just go off the grid for days at a timehttps://www.nytimes.com/2020/10/26/us/politics/biden-iowa-polls.html …
The thing is that strategy does not work with people who voted for Trump once already. You need to actually convince them beyond "I'm not Trump"