I don't think that would work well in this country, but I would support automatic voter registration and having ballots automatically mailed to all registered voters.
States with full Democratic control should be pushing hard for expanded voting rights in contravention to the Republicans and their voter-suppression tactics.
This. Mandatory voting was for years in our books and nobody remembers anyone getting punished for not voting. It's an unenforceable law.
But automatic registration of every person that reaches adulthood, that's a no-brainer IMHO and it could save a lot of money and time for both voters and states.