If you look around hard enough, there’ll always be someone whom you can help in your community. If you do not personally know of anyone, ask your friends and neighbors, contact your most local over religious leaders, as they often are told about these sorts of needs.
You can plan a service project for someone in need and have your kids help you out with it. This is an important step in teaching children compassion and how to put others needs before their own. For example, you could go rake the leaves or mow the lawn of an elderly person, who cannot do it for themselves, for free. You might help someone in the neighborhood move who needs help, or offer to help pick up trash or help with the household projects, like painting.
When you introduce children to how good it feels to render selfless service, they may just want to do it again and again.