How can I earn money (15 years old)?

I asked my mom if I could get a job, but she said wait until next summer so that's out of the question. I'm 15 years old so don't suggest things like lemonade stand. I only feel comfortable babysitting for one family and they don't need a sitter much anymore. I'm not really good at art or baking so I can't sell stuff really. I need ways to make money until next summer when I get a job! Any ideas? Thank you!