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You won’t develop your speaking skills if you stay inside your comfort zone. You’ll increase your brain power when you go out and talk to people, and be confident about voicing your opinions.
Not everybody will agree with what you have to say, but the important thing is for you to get used to talking to people and learning to accept their views. Once you get used to voicing your opinions, you’ll become braver and it will be easier for you to speak naturally in front of a crowd.
One of the ways to increase your brain power is through communication, and you can enhance your vocabulary. You cannot imagine the wealth of information you can get just by talking to others. It’s also important that when you speak to people, you look straight into their eyes; it’s a sign that you’re a confident speaker. People are more inclined to listen to you if you maintain eye contact.