1
If you have reset Windows and your files are now missing, did you choose the option to keep your files?
2
Open File Explorer, then go to the C drive.
Is there a folder named Windows.Old on the C drive?
If there is, go into that folder, there is a Users folder in there, open it.
Then go into your user folder in there to check if your files are available in there.
if they are, move them out of there as soon as possible, because that folder will be deleted automatically.
3
Otherwise, log into OneDrive (https://onedrive.live.com/) in a web browser, are you able to find your files synced there?