Tbh did my voice training in like 3 months of practicing every day. I recommend milk (or a substitute )and beer to loosen things up

I started pretty low. Remember it's still a muscle, treat it like weight training , have protein after, maybe caffeine before. Make sure you do the same exercise (e.g. say the same words)

I probably still should do a little more as a touch up but I pass so it's hard to get motivation for it