I do reiterate here that if you vocalize, pushing the air in the esophagus strongly against the region where the vocalization functions and its upper part, you are sure to make a higher tone.
The result is 100% guaranteed and you are convinced of this technique of high vocalization. You can check whether this technique worked out well by feeling thirst after a number of voicing practice, since the air hits straight to the region every time you vocalize this way.
3. To make it a habit to punctuate your speech appropriately for enough refill of the air to continue.
It is itself an evidence of improvement in esophageal speech that as you progress, you can speak longer sentence in one breath. However, it is also true that one breath cannot last long enough for much longer speech.
