Bungie wont forcibly unlink it, so that leaves you with 3 options as you don't have cross-save enabled. - leave it the way it is and continue without linking a different PSN - work with PSN and regain access - use a throwaway account (Twitch is the usual one) so you can unlink your Steam and move to a new Bungie profile but in doing so you will lose things such as all redeem code emblems, your Bungie friend list, potentially any Twitch/Prime rewards, most likely all Bungie rewards, and you also likely have your name changed to your Steam and may not be issued a token to change it back. If your Steam name is used during sign up but is filtered you may end up stuck as Guardian####