By improving your public speaking (or even by starting public speaking in the first place), you will gain much more than just being a better speaker. For a start you should start to feel more confident about your communication in general and that may be useful in other areas of your life.
Meetings, interviews, presentations, emails, texts and social media are some examples where being a better communicator will give you the edge. Improve your formal written communication as well (everyone should at least be able to write a convincing letter with a beginning, middle and end) and you are on your way.
There’s nothing to it, really. Learn about it and do it.