Writing is fine. 808 could be a bit stronger in the mix. Brass has too long of a decay on the reverb and just too much of it in general. It leaves it feeling weaker. Needs to be darker. Snare could use more grit. Flute is so mellow, it just doesn't leave a good taste. I just feel your samples and instrumentation aren't really standing out too much. Work on subtlety and presentation.