Hi,
Something here might help:
What happens to my data and access when my Microsoft 365 for business subscription ends?
https://learn.microsoft.com/en-us/microsoft-365/commerce/subscriptions/what-if-my-subscription-expires?view=o365-worldwide
You may also reach out the experts in the dedicated Office 365/Microsoft 365 forum here:
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_account
Best regards,
Leon