I got my steam account hacked about 2 ish months ago and with that i lost both my Ubisoft account as well so i created a new one and unlinked everything connected to my steam account but i seemed to have skipped over my bungie account which is still connected to my previous steam account and it seems like the hacker who got my account has not only been using my account and playing destiny but also purchased all expansions from steam and leveling up my character form 300 to like 380 i honestly want to unlink my steam account to prevent this person from further hacking my account and other stuff possibly linked to it such as by Xbox account is there a way to work around the cross save so i could unlink it without needing to authenticate the steam account
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You can't, as of March 25th Bungie removed the ability to unlink platform accounts (except Twitch). You will need to work with Steam to regain access to the account and secure it to prevent that person from playing Destiny and using your characters/gear etc. Even if the above march 25th linking change had not happened, you would not have been able to unlink the account anyways without being able to authenticate it. Bungie will not unlink the account on your behalf.