A Worlds End

A person who deliberately or accidentally fell off their path to success, freedom, or fulfillment, instead choosing to stay within the level they've achieved so far.

People usually use this to define those who has made serious bad choices in life resulting in a lifestyle that is dangerous to themselves and others or has serve consequences.

Junoir: "Thomas got arrested for sex trafficking, he's not getting out of prison anytime soon"
David: "Thomas being a worlds End???... Who knew."