KIDS Short Story (1500 words) using the Hero's Journey technique

Based on this story i need a new Short Story (1500 words) using the Hero's Journey technique, changing the characters and changing the settings, but in the end, they have a similar message of self-improvement. The stories are meant to be understood by 6-8-year-olds from any country or culture, not to mention particular foods, meals or circumstances. No fantasy, only for ordinary world. Thank you