Lots of good suggestions on here. I'll just add in with my own $0.05.
- Write reviews of bike products - share you knowledge and experience with various products that you're using.
- Take a mechanic course - this will allow you to learn more about your bike and maybe even help others that are stranded on the road
- Photography - If there are any bike races in your area, volunteer to take photos. Or better yet if you're able to sell your photos all the power to you.
- Volunteer - There must be some cycling events in your area that need people to help out.
- Teach - I know in my area that are local groups that teach people to ride. Perhaps there's an opportunity there.
All for now.