Hi,
I suggest you follow these steps and check if these ways will help you get back files:
https://www.howtogeek.com/759403/how-to-restore-deleted-files-and-folders-in-microsoft-onedrive/
https://www.cleverfiles.com/howto/recover-permanently-deleted-files-from-onedrive.html
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
If none of these methods can help you, it is recommended that you contact Microsoft for more professional help.
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