Where to volounteer if I don't have time?

I feel the need to help people in need. I am witnessing so many people dying around me and I see that the only thing that truly matters in life is to leave a better world behind us.

The problem is that I have a full time job and I couldn't find any organization I could join at night only or in weekends. The only thing I'm doing is donating to charities but I feel it's not enough.

For information I live in Europe.