[quote]How do I remove my old PSN account[/quote] You cant without authenticating it. You are required to be able to authenticate all accounts to alter a cross-save setup, so you'll need to regain access to it otherwise your setup is stuck as is. [quote]will I lose all my characters too?[/quote] Your current characters are tied to the PS account you're trying to remove. so deactivating cross save (required step to unlink an account) will stop you being able to access those characters on Steam and Xbox