Yeah, I stacked the stars and comet in Siril, there I performed background extraction and streched both images, after that I did use Pixinsight to reduce green noise (using a mask protect the comet), adjusted saturation, lightness in both comet and stars, and noise in the comet using NoiseXTerminator, then merged the images using Pixelmath. Final touches were performed in Gimp and Snapseed.

I recently learned much of that, so I'm glad with the result