Dear M Kashif1
Thanks for raising your concerns in Microsoft Community.
We understand that you are experiencing data loss in OneDrive.
It needs to be explained that OneDrive is only a synchronization platform, and file synchronization is bidirectional. This means that if you add, change, or delete a file or folder in the OneDrive folder, it will also be added, changed, or deleted on the OneDrive website, and vice versa.
After you stop your OneDrive subscription, the OneDrive storage space will be reduced to 5GB, and the original files will be cleared, causing the files on your computer to be cleared as well.
After you expand the space again, you can try to restore the OneDrive function. This operation can undo the operations on the files in OneDrive within a month. You can try to go back for a period of time to see if you can recover.
Restore your OneDrive - Microsoft Support
But if it has been more than a month, or you tried but couldn't recover, you need to contact the OneDrive team to help you find the lost files.
I hope the above information is helpful. If you need further assistance, please feel free to reply.
Best Regards,
Tracy - MSFT | Microsoft Community Support Specialist