It could be possible to re-release the old quizzes i believe, if one goes to the old quiz, i think you can edit it and change the open dates (not sure if you can, just a theory)
Edit: Just tested it, you can in fact re-open them. I tried it on a test that i created. Going to try on a test someone else made, see if it works too.
Edit 2: Just tested it again, you can open any old quiz by changing the end date of it, provided you can find the old quiz.
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