Voting should be compulsory.
E.J. Dionne Jr. and Miles Rapoport have a book-length argument to this effect, but they also do a nice five-minute summary of their argument at LitHub.
The summary of the summary: we recognize serving on a jury as both a right and a duty, because if we didn't we could not have anything like the system of justice we have (or aspire to). That every citizen should both be able to participate in maintaining democracy, and should have to do this small thing, is the same idea.
Compulsory voting would require Sunday voting, or Election Day being a national holiday. It would also require a minimum of two whole political parties that valued democracy more than their own self-preservation.