Please don't surf Reddit sub lifehacks and post from there, if you figured something on your own, and it has been useful to you, then only post here.
In my case, I figured recently that if you speak while breathing out, the speech becomes smoother and more resonating.
There are people who naturally speak while breathing out so this may be useless to them but in my case I used to speak while holding breath or breathing in and in turn my speech was shallow.