There are a few techniques you can try to make your voice sound deeper without straining or hurting your vocal cords or throat:
Relaxation and posture: Ensure you are relaxed and maintain good posture while speaking. Tension in your body can affect the quality of your voice. Stand or sit up straight and keep your shoulders relaxed.
Diaphragmatic breathing: Deep breathing from the diaphragm can help create a deeper and more resonant voice. Practice breathing deeply, allowing your abdomen to expand as you inhale, and contracting as you exhale.
Slow down your speech: Speaking slowly and deliberately can make your voice sound deeper. Take your time when speaking, and emphasize the lower notes in your voice.
Practice vocal exercises: Engage in vocal exercises that focus on deepening your voice. For example, humming in a low pitch or practicing scales in a lower register can help train your voice to produce deeper sounds.
Resonance exercises: Resonance exercises can help create a deeper and richer tone. One such exercise is "hmm" or "ng" sounds, where you produce a nasal sound at the back of your throat.
Seek professional guidance: Consider working with a vocal coach or speech therapist who specializes in voice training. They can provide personalized techniques and exercises to help you develop a deeper voice safely.
Remember, it's essential to avoid straining or forcing your voice into an unnaturally low pitch. If you experience any discomfort or pain, it's best to consult with a healthcare professional or a voice specialist. They can provide further guidance tailored to your specific needs.