The board admin will be indeed the only person to be able to reopen the boards. If you have the board link, feel free to reach out to trello.com/contact, so we can take a look.
If the board would still be accessible, board admins are marked with a purple chevron on their icon: https://help.trello.com/article/753-presence-and-admin-indicators-and-gold-crowns-on-user-avatars
If you had to thrive a new habit during a lockdown, what would it be? Trello
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