I'm a speech path.
Sf is right. Volume is achieved by increasing subglottal pressure, which is the fancy way of saying supporting the breathe from your belly. Don't suck inyour gut. Relax it. Think of the little kids who wail and you can hear them from across town. Nice relaxed potty bellies. Stand tall, breath down, belly should move out as breath comes in.
Taking a big breath from your chest isn't as effective. You can get volume by increasing muscle tension at your vocal folds. This runs the risk of slamming the folds together (like clapping really hard -ouch). Like yelling. Or talking over loud music at a party. You go hoarse from doing this and over time can stay like that from little callouses that form.
The throat puke posture is affecting resonance. Makes a bigger space fore the sound to resonate. Makes for a fuller sound.
In general, to Increase volume, work on breath support. To work on clarity, speak at a slower rate, which will make it easier for your listeners to hear, discriminate and process your speech.
To get the hang of belly breathing, try it lying down. Lace your fingers over your belly and breath in. Your fingers should move.



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