A Microsoft file hosting and synchronization service.
Based on the dates you provided, your Microsoft 365 subscription had been expired for more than six months. Microsoft states that when an account remains over its OneDrive storage limit after a subscription expires, OneDrive and all files within it may be deleted after six months. Unfortunately, Microsoft also states that once this account-level deletion occurs, the files are non-recoverable.
This is different from deleting files manually. Normally, files deleted from a personal OneDrive remain in the Recycle Bin for 30 days, but a deletion performed after the account-expiration warning does not place the content in the regular Recycle Bin.
Unfortunately, renewing the subscription now does not restore files that Microsoft has already permanently deleted.