To keep your natural voice strong and clear, experts from NIDCD and Medical News Today recommend: Taking Care of Your Voice - NIDCD - NIH
: Spontaneously say "Mmm-hmmm" as if you are sincerely agreeing with someone (e.g., in response to "Dinner is my favorite meal"). Change Your Voice, Change Your Life
Natural projection should feel like a "buzz" or vibration in the mask area of your face (lips and nose bridge) rather than being strained in the throat or nasal. To keep your natural voice strong and clear,
Most people speak at a pitch that is too low or too high for their vocal cords, leading to fatigue or a lack of authority. Change Your Voice, Change Your Life
Finding your natural voice can improve how others perceive your authority, credibility, and emotional sincerity. Essential Finding-Your-Voice Exercises