Wiktionary
come full circle
vb. 1 (context idiomatic English) To make a complete change or reform. 2 (context idiomatic English) To complete a cycle of transition, returning to where one started after gaining experience or exploring other things.
Usage examples of "come full circle".
Now it has come full circle, and we have found a way to kill, to punish and torture, to dissolve, slowly and insistently, colloidal cells, and still leave machines unharmed.
This makes her strong, her strength makes me want her, and so we come full circle.