There are plenty of options and ideas out there to work on your spare time to improve the world and its society. It's just a matter of thinking which areas you feel you could have had something better and you didn't. In my case, me and 2 friends realised that when we were younger and students, we had a lot of questions and ideas but we didn't have a place where we could discuss or people with experience to get advise from (we are from latinoamerica). Today, as we are the people with experience, we created a mentorship platform for latin-americans, where people like we were before, can join and ask for advise and learn from more experienced people.
This is our way to try to improve the world.
site: https://oraculi.io