Voter registration drives! This is an election year- there are no shortages of volunteer opportunities during this cycle.
In my town, you need to be 18 to become a registered elector (the people who knock on doors with the clipboard who can register voters and witness the paperwork). But city hall has tons of opportunities for volunteers to do data entry, work with the electors to figure out which neighborhoods to target.
Google “league of women voters” (you don’t need to be female) to see what volunteer positions are available. Presidential election years are filled with opportunities!