A Microsoft file hosting and synchronization service.
Dear Kim,
Good day! Thank you for posting your query in our community.
As per your description, it seems that you have changed domain around December 16th, and need to restore the folder in the OneDrive with old domain.
If my understanding is right, there's a possibility that it can be restored from the cloud service. As forum support, we may not have enough permission and resource to directly check the tenant service from backend.
As the file backup in cloud service only within a short window, in this situation, we'd sincerely recommend you contact your Microsoft 365 administrator, follow steps in this article and try to create a support ticket to contact Online Support. The support team over there has higher permission than us, they can remotely help check the situation on your side, involve more resource to help you do the restore. This would be a more efficient way in handling this case for you.
For reference: How do I find my Microsoft 365 admin?
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
Sincerely,
Rhoda | Microsoft Community Moderator