Why would you limit yourself to the cheap optics and low resolution of a p900 when far better option exist? It has a tiny light gathering capability (the actual size of the lens element) and a small sensor, not well suited to this kind of imaging. It's no surprise it doesn't do a good job. That's why anyone who is serious about astrophotography has a telescope like I linked earlier, and an slr or milc camera with a larger (APS-C or full frame) sensor for image capture.

The p900 is a toy vs what people use for capturing actual good astro images.

https://astrobackyard.com/astrophotography-equipment/

Once again I refer you to the images captured by Con Kolivas, you may know him, he was the guy who wrote cgminer, contributes to the Linux kernel, and does some amazing astrophotography, in addition to being an Anesthesiologist.

https://x.com/ckpooldev/status/1519150489006338049

He's here on Nostr too. You could probably learn a thing or two from him.