Keep in mind that in some tld’s (like .nl) the whois data actually dictates who is the legal owner of the domain. If you get into an argument with your registrar, and the whois data shows their name, you can’t take action to move it or reclaim it without their approval.

Also if you let it expire, for the cool off period, only the original owner can reactivate it, that means you can’t reactivate it through another registrar. Maybe your current registrar allows it, bit that’s a maybe.

Nice, great step! Just in case: did you check if you have any forgotten “log in with facebook” linked applications? You might want to check them to see if you have configured an alternative login. If you’re not sure, I very strongly advise you to undo the delete while it is still possible, and go into settings to check for this. When you’re sure you’re all good, you can just delete the account again.