For me getting the colour balance corrrect is one of the most difficult tasks. You are getting there but I don't believe your sky or nebulosity ought to look brownish (it does on my screen).
Perhaps start by telling us your processing tools and methods. It's really hard to comment generally with so little information given there are so many tools and options in processing! And, part of the equation is how and how much data you captured because these facts alone will influence what you will be able to do.
Peter
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