Destiny 2 characters, inventory and game progress are linked to platform accounts. Bungie.net profiles in and of themselves store no Destiny 2 characters or game progress. Your profile currently only has one Steam account linked to it, I don't see any other accounts linked. If you were thinking you could unlink Steam account #1 and replace it with Steam account #2 and have everything you had under account #1 available under account #2 then that is not possible since game progress is stored based off your platform account and not your bungie.net profile.