Hi @jin and welcome to the community!
I don’t have an edit for you with darktable, but I could show you what I managed to do in RawTherapee.
But in general, I don’t think this is going to give a spectacular result. There is just not enough contrast in your picture, and I think quite some stray light. I’m no expert in night photography, but maybe you can find some useful tips here: Star Trails and Night Sky photography.