To really change the world, we have to help people change the way they see things. Global betterment is a mental process, not one that requires huge sums of money or a high level of authority. Change has to be psychological. So if you want to see real change, stay persistent in educating humanity on how similar we all are than different. Don't only strive to be the change you want to see in the world, but also help all those around you see the world through commonalities of the heart so that they would want to change with you. This is how humanity will evolve to become better. This is how you can change the world. The language of the heart is mankind's main common language.
The world is no longer white, black, yellow and brown. Through love, tribes have been intermixing colors to reveal a new rainbow world. And as more time passes, this racial and cultural blending will make it harder for humans to side with one race, nation or religion over another.
The problem will never be diversity, the challenging of tradition or the one person that questions the way life should be. The person that shows the world that this is wrong, there is a perspective you didn't consider, this is worth fighting for and being different is a blessing, will always be the solution for change.