Can I get any smarter than I am?

Of course. "smart" can be a matter of opinion. Wisdom usually comes from life experience. Genius is usually something that you are born with and is the way your brain assembles and uses your knowledge and experiences in your daily life. Intellegence is conventionally thought of as how much you know. So, to answer your question, yes you can get smarter. Start by exploring your interests, travel and learn.