As a concert promoter myself here's some advice:
tell your singer to start rapping and freestyling just for fun--its a great exercise for lyricism and your music will have better lyrics as a result (keep him singing though live unless you wanna incorporate some kind of flows into your music), and tell him to get voice lessons (be chill about mentioning it, even take them with him if he's sketched) it will be a good investment but i like your indie-ish sound there's some good potential and your guys stage presence is good. Try focusing on connecting with your audience whether it be mentioning something about weed (they love that) or something funny (those 2 usually work the best) and you will be a successful band at least live. Keep playing together, smoke trees and make music and make it something that's only fun to you guys--nobody likes listening to knockoff bands (not saying you were but that's just some advice).
Other than that, your music quality will increase exponentially when keep playing together for a few years. and keep having fun thats the only reason you should be playing music in the first place so never ever lose sight of that.