How you improve or max out your charisma?

I have a lot of charisma with my friends and yet i am still introvert.

I lied to bunch of people that i do not sleep with that woman and they belive me! I want to know how to max it out even more. Want to say that I am the leader everywhere I go and people do what I say most of the time. These days I feel litle too tired and my charisma isn't good like it used to be. Any tips?