Hi Peter:
You could not have archived your course, for the simple reason that there is no archive feature in Canvas. So rest easy on that account.
Student access to courses is controlled at the account level by your school's Canvas Admin. They set the dates/times courses will be available to both students and teachers based on term dates and school policy. You will likely need to contact your school's Canvas admin.
However, depending on the permissions granted to teachers by your school, you might be able to change the end date for the course in course Settings. This guide will get you there: How do I change the start and end dates for a course?
Good luck,
Kelley
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