Filler (attempts) to make music.

[Gors]

this song lacks any kind of real structure

What was you thinking when you wrote this piece? An army? A boss? Something good or bad? The mood it tries to convey seems an uneasy moment, but the music doesn't develop much and doesn't really follow a cohesive chord progression.

It's hard for me to teach about those but listening to other people's music with the same general idea you want to do works wonders for me. By studying others music, either by listening to it vbery thoroughly or covering it myself, I learn the nuances of composition and I try to apply it on my own.

This being said this song also feels very empty because there is not enough instruments that cover the desired wave frequencies. That is, You have acute and mid notes in the music but there is no bass, so it feels very empty as a result. Try studying how actual marching music or military influenced music do this kind of music and then you'll have more stepping stone for your music.