So I pre-ordered the expansion and used the 70 boost and when I take the portal from SW it takes me to the destroyed darkshore. i go to Zidormi and all they will show me is what happened. Any idea how to get back to old Darnassus since the option not there?
You’ll probably need to unlock the Warfront to get Zidormi to give you the option to go back. (Your character is likely stuck in an in-between phase right now.)
That will mean doing the BfA intro, unlocking BfA world quests, and then doing the quest chain to unlock the Darkshore Warfront.