If you want to be heard, DON’T raise your voice!
The minute your voice goes from “normal” to elevated, those listening to you will focus on the raised voice, rather than your message. They will focus on your anger. They will wonder IF you’re angry. They will think about everything BUT your message.
So…. Don’t give them a reason to shoot the messenger.
Keep your cool. Speak calmly. Give your message a chance to truly be heard.
(Oh… And if you are angry, take a walk.)