13, Trying to Earn Money, Help!?

I'm 13 and looking to earn some money. I'm past lemonade stands and that stuff. I casually babysit, but you can't really force people to let you baby sit. I don't want to end up with a bratty little kid and feel uncomfortable because I barely know the parents. I've lived in my neighborhood for 12 years and I'm one of the youngest. Bottom line, I need to earn money and I need help figuring out what I can do. Thanks!