Where To Go With This?

[River]

I have a composition that is FAR from finished, I call it: Got To Go Fast!; it's for concert band. But every single time I try to compose more of the song, I go brain-dead! I was wondering if anyone had any suggestions? Here is the audio:

 

[Nutmeg392]

Perhaps, if it isn't too late, you could add one of those intervals that musicians often do in which the pacing and style changes or shifts to something softer or harsher. When you finish it you might use a long, drawn out note/series of notes or could end with a quick crescendo. I'm by no means a professional so there are probably better terms for this but that's my two cents! Either way, I like it so far!