Try asking your parents if the family can have a yard sale. Sell some of your things for cheap and keep the money (as long as your parents say it’s okay).
Also, doing a car wash as @ItalianPrincess1217 suggested, or looking around the house for odd jobs as @guitargirl101 said, could be great ideas. In addition, you could see if any neighbors need help with their pets (grooming, pet sitting, taking the dogs in the neighborhood for a walk).
You could also try to see if any younger kids need tutoring in a subject you’re good at.
What about a lemonade stand that also sells homemade cookies, brownies, etc.? I’m sure you’d make nice coin on that!