You can do some of what you desire to do, for now. You can help a person in need, every day look for one person in need and reach out to him or her. Someone looks troubled or lonely, say: hi. You look so sad. Are you sad? OR, you look lost, maybe you need someone to talk to. You can talk to me.
Yes, as Anita said, there are people right near you who are in need. Nature is need of protection all around us. Have you thought about starting a garden? You don’t need too much money for that. Gardens are not just for growing plants anymore; you can create a whole ecosystem. If you can’t travel to new places, why not transform your home into a new place?
You can be a tourist in your own hometown. What makes you a traveler is not just going to new places, but seeing old places with new eyes.