It's a good idea to check whether you're still registered to vote.
Voter rolls get purged every year to keep them up to date. But it looks like recent purging has been quite... enthusiastic in a number of places.
I think you only have till TOMORROW, Tuesday 9 October to check and re-register if necessary.
If you're a voter in Georgia, you can check here: www.gregpalast.com/georgia-voter-purge-list-2018/
(Greg Palast is a long-time suffrage supporter, so I trust that site.)
More on vote-purging here:
This website will tell Georgia voters if they were purged — but they must reregister by Tuesday
www.rawstory.com/2018/10/website-will-tell-georgia-voters-purged-must-reregister-tuesday/