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