2. Click File > Export > Notebook > OneNote Package and Export this notebook.
3. Sign out your Campus account, and sign into OneNote with your personal account, then go to File > Share.
It will alert you that this notebook have to be saved on OneDrive or SharePoint before sharing.
4. Click OneDrive and browse a location where you want to save this notebook. After the syncing process is finished, then you have already moved this notebook.