So this is something totally random. But here's a prompt that might be fun to try.
Have your character visit a museum (it can be totally as crazy or creepy as you want) and have something strange happen.
I know in my nearby museum, you can bring in things (rocks, skulls, dead animals, creepy things like that) and they're pay you for it and display it. Maybe somebody brings in a magical rock and somebody else buys it or takes it? Or maybe the dealer works for a magical underground society!
Or maybe there's an exhibit, like the Dead Sea Scrolls, and someone gets sucked into the land of the Israel and has to save King David from a assassin attempt.