With a starting place of the world as it is now....
Since environment has such influence on individual development, I would instill in society through consistent, offered education at an early age, values such as self-awareness, self-responsibility, empathy and compassion, courage and confidence, creativity and following intuition.
I would encourage individuals to find their truth within, to appreciate diversity and respect the right of others to their beliefs and choices.
Then, as much as it would be my personal wish to see one world, there might need to be a split in the world. Those who don't want to change their habits and prefer to continue along the lines of greed, ambition, control and so on can have their experience. And those who consider it pure joy to live their highest attibutes and qualities and express themselves with limitless creativity, would have the opportunity to experience life in their chosen way, unimpeded by restrictive cultures, traditions and systems.
The two worlds would not need to be much aware of or involved with each other, but still the borders could be crossed for evolutionary purposes as a happening.
That is, one world would be of such higher vibration that the other would not recognize it, except at moments of breakthrough as we have now between this and the subtle. The difference is that now the subtle is inhabited by astral entities and in the proposed version, humans would have a choice to move freely in a more ethereal state in harmony with the pulse of the universe. The perfect world follows a course for those who choose, of conscious evolution.