Hey, nice work. I play the bass in a band with my two brothers and sister. Have been doing so for about 10 years now. Anyways one thing that we've found that makes us sound better and makes it more engaging is something we call dynamics. Like building up and then going down. I'd suggest putting more dynamics. Just as people don't like to watch the same thing they don't like hearing the same thing so to speak. Have like 5 different levels for how loud your voice is. This adds more than you think. Keep it up!