A Microsoft file hosting and synchronization service.
Hello,
Is this a personal account or a work/school account?
If it is personal account, unfortunately once deleted from Recycle Bin, it is gone. It works as it is designed to do, the files cannot be recovered.
If this is a work/school account, it might be recoverable, depending on each organization's retention policy. Reach out to your organization's IT support team, they would know what the retention policy is for your organization and can recover for you if it is still within the defined retention period.
==========
If these files were previously synced to a local device, there might be a chance you can use paid third-party data recovery tools to recover them, but it is not a guarantee.