Hey, I've just listened to your track!
I simply loved it. The atmosphere is incredible, and the musical ideas and symbolism come across very clearly. The mix sounds great to me, so I don't really understand why you're not satisfied with it.
I also think you have a strong grasp of harmony and orchestration. I especially loved the choir parts, and I found myself wondering which plugin or VST you used for them.
The only thing I could point out is that the piece ends a little too early for my taste. I would have loved to hear an even bigger final climax, perhaps extended with a strong horn melody or another memorable statement of the main theme.
Overall, I really loved your submission.
Good luck with the rest of the voting period!