I say just work on the fundamentals such as, eating healthy, fitness, and most importantly good communication. Obviously its going to take some time to see the result but anything such as striking a conversation with a casher, taking a speech class, 5 minute recording of yourself talking, etc. can have a big impact in your life. No need to do all that extra stuff because you will get overwhelmed with trying to learn a lot things that you will eventually end up doing nothing and feeling miserable.