The world has loads of human bodies to relentlessly want for more and more despite having all. What the world lacks are real human beings, with veins of steel and heart of honey.
Work, work and work, until you see the change manifesting as reality, which everybody else only wishes for with their hands joined and head bowed as meek, mind-less, second-hand worshipers and slaves of illusory masters.
Dig deep, past the pain of knowing you failed or that you could have done things differently and past the temptation to self-loathe. Live in the pain of the mistake, notice your ego's attempt to protect you by justifying your mistake or blaming another for their part in a situation. We must go deeper into ourselves, to tap into the wisdom that resides underneath our mistakes.