While I understand and sympathize with this position, simply hanging onto Donald Trump for another term is not going to do anything more than slightly delay the effects of the leftward lurch of the Democratic party, a lurch Trump's elevation has enabled and exacerbated. https://twitter.com/baseballcrank/status/1305723915931496448
If you believe that the extremes of the Democratic party push some people towards Trump, thereby forcing them to back someone they might reject under normal circumstances, then the reverse is valid as well. Trump's extremism will beget more leftward extremism.
If conservatives/Republicans continue to normalize voting and enthusiastically supporting someone like Trump, the road back will be even more difficult as the opposition digs in even more.
My concern with Trump was never primarily the short-term impact of his policy positions or that he might suddenly begin instituting a secret liberal agenda. It was clear he'd gladly slip into a "conservative" skin in order to gain support and power.
It's the long-term impact that supporting him and defending him will have on the credibility of conservatism & Republicans (and a more personal concern of mine, the credibility of evangelicals) that keeps me as radically Never Trump as I have ever been.
Just to be clear... I will not be voting for Joe Biden nor am I encouraging anyone else to. I know, terribly unsatisfying position, but it's the best I can do in good conscience.