Honest question from someone outside the sector: most night-sky posts I see are a Milky Way shot and a caption about how small we are. They all look the same.
What has worked for you? I am thinking about what makes someone stop scrolling, not about what wins photography prizes.
People, not skies. A photograph of a child looking up, or of a guide explaining something with a red torch, gets three times the engagement of a beautiful empty sky. The sky is the setting; the visit is the product.
And whatever you publish, say what the visitor will do and how long it lasts. “Two hours, easy walk, we provide the telescope” converts far better than any adjective about the universe.