A lot of what needs to be done is making sure that the Harris win is large enough that you can’t easily claim that a handful of ballots should be tossed and change the outcome. That means:
- Check your voter registration — part of the Republican strategy has long been invalidating registrations so people can’t vote
- Volunteer — nothing in the world quite like talking to people.
- Donate — money is used for everything from ads to voter turnout operations
- Organize; be prepared to turn out with others in your community to actively object to any effort to ignore your votes
The College is structured in a way that allows a candidate to win against the majority of the population, without even needing individual electors to be corrupt. But yes—corrupt electors can also switch their votes independently; there are laws penalizing them for doing so, but their votes are still counted.