I suspect you'd have to never cross a border/barrier where ID was required, and you would need to pay cash (or bitcoin) in-person for everything, as you would be cut-off from the banking system. You'd probably also be limited to earning cash in work that didn't require your nonexistent legal identity.

Moving to another country is a safer choice: you get to choose the level of “deadness” you are to your surroundings, if you just cut all ties nobody’s going after you. And you can start a new chapter somewhere you never existed in the first place.

You could probably commit a crime, get bail, and then submit proof that you were dead to get away with it?

It seems a great hack for a new life.

Declare yourself dead and start again!