This is an interesting vibe.
Mix wise, to get that cinematic sound, you'll want to mix things more in space, both near and far. It sounds copressed in space. Close things have more delay and are drier on the reverb, far things have less delay and are wetter.
Also, the dynamics are still pretty midi - one thing I do is I overlap attack and release, and set the attack and release to longer on my sustained midi instruments like strings, vocals, and horns. Also, compression makes more complex mixes softer.
Great work though, I can hear what you are after and I can just imagine how epic it would sound with a nice cinematic mix.