At the start of Oedipus at Colonus, Oedipus is now old, blind, led around by a child. He cannot act out into the world, at least not in the way he once acted.
The young Oedipus once impressed his will on to the world. Who I am depends on creating myself through action. He understood himself as product of exertions, as acting out into world, creating a new self that will not kill his father and sleep with his mother. Not anymore.