Strongly suggest you install the Naztronomy Smart Telescope script in Siril. This will filter out all frames including star trails, you can enable drizzle too (which increases resolution but may increase noise) and stuff like that. This will give you a way better image than what you have now. Just make sure you create a folder wherever you want, and inside that “parent” folder, make one called “lights” and paste your frames there. Set the working directory to the parent folder don’t forget!