The default Photo editing tools are very basic, and you’ll struggle to get good results with the lack of parameters. You’re better off using Lightroom Mobile or Snapseed.

But if the default is the only option, start with the auto edit, change the strength to your liking, tune down the highlights, bump the saturation slightly, and give it a slight sharpen and noise reduction.

However, if you want to get the most out of your data, consider using a dedicated desktop astro editing program like Siril or SASpro.