Your fourth set up. If you haven't foreshadowed the upcoming problem already, you should do it here. The Inciting incident is coming up so we want to build up to it otherwise it will seem weird and random.
If you have not yet introduced the people involved in the inciting incident, you should start doing that now. If their presence is meant to be some kind of surprise factor, that's fine. We can wait. But if the inciting incident involved the main character's best friend, then we should have met them by now.
You're now 4000 words down and we're loving this new world that you've introduced us to. Great job!