So...I don't know if anyone here lives in a state where they have open primaries, but here's an idea I'm throwing out there, which somebody may already have put out: why not go to the Republican primaries en masse and vote for somebody other than Trump? If we can get enough people to vote for a specific non-Trump candidate, we might just be able to prevent him from becoming the Republican nominee. I don't have any data yet on which states are going to have open primaries for the Republican Party in 2024, but I'll update you.
In the meantime, if I were to pick somebody other than Trump for the nomination, I'd pick Nikki Haley. Not only is she a woman of color, but some of her opinions don't seem all that extreme.