AEIOU, ah, eh, eeee, awe, ooo.
Don't "touch" the throat. Don't use the throat.
Don't lift chest up like dramatic. Become big round person. Well, you're round already. Become rounder.
If you can't shake the paint, take a break.
Put finger on mouth and suck in, to feel what it's like to "fill your tank."
Keep your nose open. Don't make sound when you breathe in your nose. Like breathing in mouth and "cheat" with your nose.
Remember, gentle pitch movement up and down like Slinky toy, no jumps.