I have always thought of gravitas as a quality; something a person has or doesn’t, that either comes naturally or develops through life experience. On examination my reasoning for that belief is flimsy. I’ve no clue how I thought some people acquire gravitas or are simply born with it and others don’t, irregardless of their experience.
Caroline Goyder argues in Gravitas: Communicate with Confidence, Influence and Authority that gravitas is a skill that anyone can develop. She talks about the way that the tone and pitch of your voice, your body language, the congruity between what you do and say, and, perhaps most of all, your self-awareness, contribute to how people receive you.
There are lots of useful exercises aimed at understanding how you come across and the thinking patterns that might be holding you back. There are lots of small things that are easy to implement and build up into a big impact.
I was convinced that gravitas is a skill and that anyone can learn to have more of it. I read a lot of this kind of book and don’t often feel the need to review them, but this one actually changed how I think about something.