I disagree. While Trump is polarizing, there are plenty of swing voters who would absolutely consider voting for a decent candidate from either party.

I am one such person. I voted for Republicans until Trump, then voted third party, then voted for Biden in 2020. I have voted for Rs, Ds, and third parties in almost every election in the last 15 years or so. I am unlikely to vote for Biden in this coming election, but I'm absolutely not voting for Trump. If a reasonable Republican gets the nomination, I may end up voting Republican.

I don't think I'm all that unique here. There are plenty in the middle that just need decent candidates to go after their votes.