Sometimes, I speak very fast (trying to change that). Recently, I have downloaded an app that helps me to analyze my pronunciation by comparing audio waves with a template. I have a lot to learn. I am taking a course in public speaking to boost my confidence.
But when I look at the videos of successful people of Indian origin in Silicon Valley, I don't see them faking an accent. All I see is their competence, their expertise, their depth of knowledge in their chosen field. And this makes me believe that confidence and articulation comes from a thorough understanding of your subject- you can not fake that.