I think you have a great voice, love your relaxed style, nice use of vocal fry. Excellent for your verses, but agreed that you could amp up and solidify your choruses a bit more.
I recently came across EricArceneaux on Youtube (he offers some pretty solid free advice) - would highly recommend for you if you're not already utilizing diaphragmatic breathing. I've been trying some of his techniques and almost instantly noticed drastic improvement in stability of my notes. Basically the idea is if you breathe and push air with your lower diaphragm there's a LOT more power and stability.
https://www.youtube.com/watch?v=-SeSL9WdVBo
Honestly I think Eric's videos would put you in a great place, but if you're REALLY looking for more power even than that, look up some techniques / practice routines on "belting"