[Y_Y]

Fwiw I have a deep voice and have had a beard for more than ten years. I've read HtWFaIP and some other good self-help/pop psych. I spend lots of time talking (though often to captive or disinterested audiences). I do some meditation, and tick lots of the other obvious boxes. I still struggle with keeping people's attention and it's bad enough to bother me.

All I'm getting at is that if there's a silver bullet I haven't found it.

[JoeyJoJoJr]

Is it possible that it is the environment you are in? For me it was quite eye opening moving cities and suddenly seeing that people were a lot more interested in what I had to say. Sometimes it’s not you, and it really is everybody else.

[reassess_blind]

Could it be your enthusiasm or level of overall engagement of the other parties?

Perhaps take a recording of someone you find engaging to listen to, and record yourself and really play spot the difference.