It's same answer I've offered before but I'll have the discussion again. The two biggest reasons I didn't vote for him in 2016 where his trade policies and racial rhetoric. And nothing has changed to me in that regard in the past 8 years.
I came up in the era of Reagan. He will always be the GOAT and what appealed to me most was both his love of country and his optimism but he also belief in free people and free trade. Listen to his rhetoric towards immigrants and Trump's. It's just a very different world view. I also don't share Trump's isolationist views.
Now I understand there are no perfect candidates. There is no one I'm going to come close to agreeing on 100% of things. (I don't agree with myself 100% of the time.) But Trump's attitude/policies towards trade, immigrants, entitlements and spending are not the direction I want to see the Republican Party go. (and this is on top of his 'stop the steal' stuff and telling people in Georgia basically not to vote in the Senate race costing the Republicans the Senate.)
I would have voted Libertarian no matter where I lived the past two Presidential elections but the reality is living in California my vote means nothing. If I had voted for Trump Biden would have won the state by 4,999,999 votes instead of 5 million.