my voice coach says

the voice needs to be moved and caressed like bread dough.

Knead it. Move the pitches, the resonance. Tap into lower pitches frequently, but don't hold there. Keep it flexible, silky.

Watch the glottal stops. You don't need glottal attacks for emphasis.

When you get excited, don't lose your sense of space behind you, and depth.

The larger you get, the deeper you need to get, and the more space you need behind you.

Zap meaning at the audience, rather than force. Let them come to you.

Don't pull your voice out from above. Rest in the throne of yourself. Think skeletal alignment. Float the spine up. Don't clench the abdomen - relax and re-engage, relax and re-engage.