The easiest way to debank is as part of a debanked community.
What I mean is, if you don't want a bank account, you'll need an employer who will pay you cash (or check, but you have to show ID to cash a check, so you're not really going full Snowden).
Then you'll need a landlord who'll accept cash.
Then you'll need utility companies who'll accept cash, or a landlord who covers utilities for you.
Then you'll need local stores that accept cash for your food and clothes and medicine and so on.
Then if you need specialist services (lawyer, doctor, plumber, etc), you'll need to find ones who'll take cash.
But the thing is, the more the people around you use cash, the more willing they'll be to take cash. Look for communities with lots of little hole in the wall restaurants with "cash only" signs.
Then you'll have to pay the IRS and property taxes and so forth, and the IRS does take cash but will pretty much assume your income comes from selling illegal stuff if you insist on paying cash π
Money orders are still legal, for now, and don't require a bank account, but you have to show ID to buy one, which again isn't full Snowden. But most mortgage companies, utilities, etc, that accept checks should also accept money orders, so that could be a workaround for places that just don't take cash.