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Hi Alice,
I'm sorry to hear that you're having trouble recovering your deleted files in OneDrive.
Microsoft 365 and OneDrive have a feature called "Restore OneDrive" that allows you to undo all the actions that occurred on any files and folders within the last 30 days.
However, I suppose your files has been deleted more than 30 days. In this situation, you may try raising a support ticket and contacting Microsoft Online Support for further assistance. They have higher permission to check your OneDrive from back end and they may be able to help you recover your deleted files.
Reference: Get support - Microsoft 365 admin | Microsoft Learn
Note: To create a support ticket, you need to have admin privileges and if you aren’t admin of your Office 365 organization, please contact the admin of creating a new ticket. Reference: How do I find my Microsoft 365 admin? - Microsoft Support
Appreciate your patience and understanding with us. Have a great day!!
Best Regards,
Tina