How to improve one's speaking voice. Mine is tiny, no strength, no quality, monotone. Found something called "kharaj ka riyaz" and practiced it for a few weeks

How to improve one's speaking voice. Mine is tiny, no strength, no quality, monotone. Found something called "kharaj ka riyaz" and practiced it for a few weeks and voice quality and strength improved. Then quality went down and my voice is not irritable and scratchy. I hope it recovers.