Find your polling location. Go vote!
Your ballot will be deciding much more than just the president. Even if you did theoretically think both presidential canidates were equal in all regards (they aren’t), then vote for the down ballot races!
Keep your local school boards from having insane people on it that will ban books and harm your kids or your neighbors’s.
Vote for the constitutional ammendment questions and ballot initiatives. For instance, many states have either pro and anti abortion questions on their ballot.
Be a part of that change. Run for local office and or encourage other progressives around you to do the same
Change quite often starts locally and flows up. Those in the national party very usually come from state offices and work their way up. Make that pool of people as progressive as possible
Make no seat uncontested
Organize in every place you can. Beyond just elections, organize for unions, organize to protest, organize to stand with your community, do not given in to the complacency that the far right wants you to have
Power is not be given freely, you have to fight for it. That fight lives on and is worthwhile. Things will get worse before they can get better. But we can lay the groundwork for the future to be better