NGC 7000 – North America Nebula

Thanks for the reply to my comment on your previous posting of the Heart nebula. There is much to learn requiring so much of one's time. Processing lots of data, as it appears you are doing, will soon be paying dividends.
The really green images, mainly from narrowband data, are as you may have already become aware of as a result of the strength of the Ha data compared to OIII and SII. A way of dealing with this in software like PixInsight is to use Pixel math to balance the strengths of the filters, often requirng experimentation. This has been simplified and even automated over time in PixInsight from people contributing additional software.
Anyway, I'd recommend browsing the Internet looking for those people who are posting videos on YouTube about Siril. Maybe put a post on the forum here asking if anyone has any recommendations on Siril YouTube channel contributors.

If you've decided that you'd like to pursue this hobby a lot further and have the time, maybe have a look at the explosion of free software produced by Franklin Marek (Seti Astro). If you're interested then I can point you in that direction.

If you prefer to carry on doing this more casually to fit it in with 'real life' then that's understandable. Don't become an addict.

Been waffling long enough, you could have likely processed an image in less time that's it's taken to read this.