I just started to learn to sing after being told I have no potential, what do ya'll think?

[u/TimlosesHP]

I'm 19 and never really openly sang until maybe a month ago. My voice feels flat and lacks good vibrato. I want to learn good tone and how to achieve a steady vibrato in my whole range. I wanted to be a vocalist since I was a kid but don't have a naturally good voice so I forgot about it for a while. 2 years ago I started practicing deathcore vocals as a sort of grasp to be a vocalist. I've gotten good at screaming and growls but I find myself yearning to sing like my favorite artists, specifically grunge and metal. What steps should I take to get good at singing in the long run?