One particular simple and easy to follow tip, to add to the Toastmasters and taking leadership type courses advice, is that you should also you signal to those around you of your interest in these things as well. Some of the other advice here can take time and be hard to achieve, you don't just turn a switch become charismatic or a great public speaker. So in the meantime while you work on all those awesome skills, don't forget to just simply let others know about your drive, ambitions, and competency.

This is easier to pull off than the fake-it-till-you-make-it trick. It's more about show-your-ambition-till-you-make-it. It's easy to do because you don't have to fake anything. It reminds me of this seduction advice I read from Mystery's first book that went something along the lines of, you don't have to be already rich to seduce somebody, you just have to let them know you have ambition and desire to one day be rich/successful.