If your child isn’t interested in school activities, they can check out your local YMCA or community center. Your child may discover different sports (like fencing), art classes (like pottery), or musical opportunities (like a songwriting class) that they'd like to try.
Your child can also ask their friends, teachers, and school counselor about extracurricular activities outside of school.
Religious organizations are a good place to find out about community service opportunities, as are groups like Boys & Girls Clubs of America. And of course, a quick internet search may turn up an activity your child will love.