According to your profile, you don't have the Steam account added to your cross-save. If you wish to add the Steam account to your CS, then you can do that in your cross-save setup page. If on the other hand, the issue is with you not having the Steam login credentials, you will need to work with Steam support to recover them. With cross-save, you choose one account as the main character save, and that save is used on all platforms. You cannot switch back and forth between saves. Deactivating cross-save will result in a 90-day security lockout, during which you cannot reactivate it. If the above does not answer your questions, please provide a bit more information on what you are trying to achieve.