Go to Denmark, Germany, France, and live in each place one year, immersed in the culture and forced to learn the language.

Something more realistic, includes going out of my comfort zone more and setting small goals. For example, speak at church in front of others and includes reading a prayer (this would be so nerve wracking, but church is a pretty decent place to do public speaking). Get more confidence when public speaking that includes speaking with force, inflection, and meaning so others find it interesting.