I don't believe that anyone who is a Trump supporter after the last four years can be convinced by policy talk. That's just not what they're about.
I don't know how well the Biden campaign did in reaching out to independents. I'm very much looking forward to the data about that. But my opinion is that we're in a culture war. It's all over the planet: it's about "owning the libs", it's about "stopping political correctness", it's about "the gay agenda", whatever the feck that is. Policy is now very much secondary to this - people align their policy positions to the candidates who represent them best in this culture struggle and not the other way around.