In a few more steps I got to here. No matter how much I used prompts to plead for a direct, looking straight down perspective, a bird's eye view, I always got perspective foreshortening that I didn't want.

So I gave up on getting an AI to give me the right perspective and took the best image I had up until that point, dragged it into Photoshop, and applied a perspective transform.

That procedure messed up the shadows around the cross and messed up the grass, so I regenerated the grass and added new shadows using a Photoshop layer effect.