There's another factor to consider. Biden didn't have a conventional campaign last time round:
In 2020, Biden kept a low profile as the spread of COVID-19 caused havoc to most aspects of American life, including the election campaign that pitted him against then-President Donald Trump, a Republican.
Trump still spoke at big rallies, but Biden did much of his campaigning virtually from the basement of his home in Wilmington, Delaware, largely avoiding crowds to prevent the spread of disease and reduce his own risk of catching the virus.