Audio setting not supporting chanting sound

I am a yoga instructor. Zoom audio settings are suppressing my Omkar "AaaaUuuuMmmmmm" chanting. I tried with all settings of Original audio, removing background noise settings but failed to fix it. Tried with different microphones as well. 
I have ensured that the issue is not with microphone device/ system settings as using same device for other applications like Google meet is working fine.
Would appreciate if someone can help with this ?

Just to go in details, while chanting Omkar and pronouncing "AaaaUuuuMmmmmm", it only captures initial "Aaa" and then it starts blocking most of the sound.