Hello, Jodie!
Welcome to the community.
When you ask for a deletion You’ll have a 14-day grace period following the deletion request, did this period ended already? In case it didn't you should be able to cancel and recover the account and the boards.
You can check more information in the link below
https://support.atlassian.com/atlassian-account/docs/delete-your-atlassian-account/
Can you share a URL of one of these boards so I can see if they are still available?
Kind Regards
Alisson
Trello Team
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