First validate whether you are able to login to Online Onedrive using the same credentials and your data is safe.
https://onedrive.live.com/
If everything is in order, please try these steps and check after each step.
- Reset Onedrive
Windows Key+R > Copy the below and paste and Enter
%localappdata%\Microsoft\OneDrive\onedrive.exe /reset
- If above doesn't solve your issue - Do unlinking and relinking of Onedrive (This will perform resyncing again, hence will take time)
Right click on your Onedrive, Click Settings, Click Unlink this PC
Wait for some time and link it again the way you did unlinking and then synch.