You are at the point of no return.
If you had wanted to complete both IWD and HoW within one gamespan, you would have needed to start HoW before you go up the staircase (in front of the six badges).
You cannot exit Easthaven where you are now. As it is, you can only complete IWD first, let the game auto-export your party when you win, and import them when you start a standalone HoW game. You will however, lose most of your gold, items are a bit iffy.
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