What does it mean to be self-sufficient?
Logically it would be to take care of yourself in all ways without relying on others. Taken to the extreme would mean living completely by yourself and your own devices. That’s not possible for the first years of our life.
If we look at it from the perspective of sovereign self-sufficiency it gets more exciting. Sovereignty being your ability to be in charge of your energy space.
As Intimate Alien said, “You already created everything, now...