The world wants to hear what you have to say! 

• Speak. You can start with your local Rotary or Lions club who are often looking for speakers
• Write a memoir about your life experience or on the subject of your expertise. Make it long or make it short. Print it or make an e-book and put it up on Kindle
• Start a blog about what you know
• Teach children, seniors, or train animals
• Tutor under achievers or those less fortunate than you
• Mentor someone in your area of expertise 
• https://www.teachforamerica.org
• http://www.nationalservice.gov/programs/americorps