Healing the world is a wonderful altruistic goal, unfortunately no one can. There will always be people who are not willing to help the world.
Why, because they are stuck in their own trauma, everyone has trauma in one form or another, you can see it in your everyday interactions. Someone is angry, untouchable, has heavy emotional baggage, bitter, unhappy, sabotaging, etc.
However to heal the world you much do the very hard and important inner work of examining your own life, it will take great effort but the positive results will be permanent, you will be happier, calmer, brilliantly confident and unafraid of living your best life.
Do the work, you are worth the effort and the world needs more healed people to help heal the world.