Buy a new OS drive and do a full, fresh install of Windows on the new drive (not any kind of "reset," actually having Windows 10 media and booting directly to it). Then put your old drive into the PC as a non-boot drive and manually recover your files from the directories.
If you have a second PC, you can recover the files from the drive, by installing as a non-boot drive or by USB using an external enclosure.
Important files should be backed up multiple places 24 hours a day, 365 days a year. Your data's existence was always on the edge of oblivion if you didn't properly back things up and certainly was when you decided to tinker with your PC for some reason. You should never be changing any Windows setting unless you...