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This is a good article from ProPublica about what happens if you requested a mail ballot but don't receive it, or otherwise decide not to vote by mail, on a state-by-state basis:
https://www.propublica.org/article/what-to-do-if-you-change-your-mind-about-voting-by-mail
https://www.propublica.org/article/what-to-do-if-you-change-your-mind-about-voting-by-mail