I did the math out in here maybe a week after the election and it was pretty clear that even had all third party voters voted for Harris it wouldn't have made a difference both in the popular count or in a number of swing states. Trump's success is because he gained a lot of votes from 2020 and Harris lost a lot. I haven't seen breakdowns of the numbers but I would guess it was mostly abstainers or libertarian voters in 2020 that came over to him this year, not former Biden voters.