All save data while on Bungie servers is attached to a persons platform's account not to Bungie.net.
Cross save only allows you to access this save data on other platforms (and is still locked to the original account it was created on) and was never to allow other accounts on the same platform to share.
Your only option is to return to the original account if you want your progress or start fresh with the new account.
Bungie for security reasons will not transfer save data to other accounts.
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thank you so much, unfortunately i dont have the old steam account