how can we restore permanently deleted files

If you were wondering how you can get your permanently deleted files back, the first thing you should do is to stop using the storage device to avoid overwriting the data. Find out if there’s any backup for that file using File History or cloud storage or even a backup service. If there’s no backup, use reputable data recovery software to scan your hard drive and retrieve the files.
Read more - https://notchox.com/resources/how-to-recover-deleted-files-on-windows/