Every guide walks you through locking yourself out for focus and mental peace, step by step.
Set a random 16-digit passcode you can't remember, disable Face ID, and read the unlock code back off your lock screen when time's up.
Set a random 16-digit PIN you can't remember, disable fingerprint unlock, and read the code back off your lock screen when time's up.
Set a random password you can't remember on the accounts that eat your day, log out everywhere, and get back in only when time's up.