Tommy Emmanuel (one of my heroes) describes learning finger style guitar, where for a long time, it’s not “music”, it’s learning a skill. Once the skill is automatic, and you’re no longer thinking about it, the feeling and musicality comes. Treating your voice as an instrument, I think it’s the same. Instead of thumb and finger independence, it’s breath control, vibrato, throat space, vowel modification, and all of the technical things that trained singers do. Wishing you success.