Volunteer for election duties. Collect mail-in ballots. Support the county counting team.
Be active locally - Run for city council, school board, little league president, etc
Set up video cameras outside voting precincts with facial recognition software (joking).
Volunteering for election duties is the most important thing right now.
Try and stop antifa and BLM from organizing riots and looting through social media. They can manage to mass flag people they don't like. We should at least try to do the same in certain situations to stop them from organizing violence and destruction.
Okay so you know in advance where they are going, then what?