The writing is outstanding, the story is gripping and well developed, the characters are well-made and iconic, and the background is excellent. What I'd like to see a bit more of is some description of the environment. Some description of the feelings that we Humans get (smelling, touching, seeing, hearing). I'd honestly like to know what people are wearing perhaps not every time but sometimes it really brings vitality to a story.
With that being said, I've been on the line to decide if I should give you around 4.8 stars for having a strong well-rounded story that to me could have a couple more things (that are like bonuses) or to give you 5 stars because while you had most things but not everything. This time, I will give you 5 stars because I'm in a generous mood.
I also invite you to check out my fanfiction "Avatar: Macai's Journey" which can be found on this platform. If you are interested, it would be nice to get the opinion of a vivid and creative writer such as yourself.