Based on many different proportions. We offer 2 hours call via Whatsapp to enlarge the voice a little bit and make the person comfortable speaking with others. This need is widely needed by many companies. Just the right technique to learn and how to do it depends on how the teacher knows about his own faults.
There are several things to notice. As special needs of learning is important. Then how to enlarge your voice by training it. How to train. How to build. Easier is to say, but hard to learn. Comfortable someone needs to become. Such way that the person knows the skill of speech. Somehow he needs to understand several paces of how to breath. How the microphone is. To develop the skill you need several things in perfect shape, especially the health. Some people have anxiety and such ways you need to learn a way to steer right. Learning the ways of sale is important, but there are several things to take into consideration; Breath Voice and Knowledge. At least when you are at most calm. You will perform the better. Sometimes you need just a song to learn the speech of it, and sing it loud. Not to be afraid of getting noticed. And if you got noticed? Why not gratulate yourself with progress?