As @Emiel1 mentioned, AirBnB 's AI needs to pick up on it. Try mentioning "Olympic national park" in your description and maybe title. Maybe include it in photos. Maybe even reply to reviews with those words if it's relevant. "Hope you enjoyed your visit to Olympic national park while you were here"
***Edit***
... And I see you've done all of these things and more... Including guests who've mentioned it by name in their reviews! I don't know what to tell you. This is one of the frustrating parts of relying solely on AI. 😐