speak in your normal voice and say ding-dong, bing-bong, king-kong and hold the ng sound for 7 seconds
repeat the same process again but make your voice a little deeper
repeat step 2 but again make your voice slightly deeper, you're done for the day. After doing that for a week (seriously wait a week) tilt your head up so you are facing the ceiling and repeat the process only twice, this should deepen your voice after a little while
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