It is of utmost importance to fully understand this basic fact and try to punctuate speech as many times as possible to refill the air and to speak with strong and clear voice.
The desirable punctuation could differ according to each individual, however generally, 5 to 7 words are appropriate for complete vocalization. The point is not to miss to refill the air at every conjunction.
Deliberate study and understanding of the above three points, and strenuous training for attaining the high tone will bring about change as a result and make it possible to vocalize high tone anytime necessary.
What you should do is to make it habitual. Random, one-time training would not bring you a good result.
In order to carry out the training, it is essential to keep your physical condition good.
