Knowing what to do to make the world better is not easy.
What you decide to do might not make much of a difference. It’s possible that you could unintentionally make things worse. You may find that after a lot of effort and struggle, you have wasted your time and nothing changed.
Most likely though, you will have made something better for someone.
So rather than waiting until you know what to do, do something. Then learn from that something and do something else. Some of your efforts may not help much. Some may make things worse, but in the end, the World will be better because you did something.