I am not the one to tell you how outside the cave works, only to show you that there is a world outside the cave. To live outside the cave is to be always thinking, to reason and theorize what this or that is and what is its purpose. Then use that reasoning to build upon the previous. It is the seeking of truths that never stops. Compare that to what you now know about your previous life in the cave, you know the tricks they play upon your former comrades.
The light of the sun is the truth. Use it to discover the real world.