Knowledge is power!
Just as each new spoken language you learn could make you think differently and increase your options to express your thoughts, each programming language you learn increases your thought process on solving problems and provide more ways to express your solution,
adding new abstractions you can throw at each new problem.
You should learn a programming language every year, as recommended by The Pragmatic Programmer. But if one per year is good, how about Seven Languages in Seven Weeks?
Why don't we help each other in learning by forming a study group? Register yourself by filling the below form we'll keep you posted.