All your theories that start with "people were tricked by Trump" or "it's about personalities" are fucking hogwash.
Biden ran significantly left of both the candidates who lost to Trump, turned out a record 81 million voters in a coalition that included young people, Black people, Muslim Americans, and folks from migrant backgrounds. The other two lost HUGE CHUNKS of those coalitions to chase suburban fascist voters.
Trump didn't create new voters; triangulation and shitlibbery blew it.