[OversouL]

If I may ask, what data breach are you talking about here? I personally know 1 of my passwords has already been part of a data breach before, but I'm not too concerned. Unless more than 1 of my passwords have been leaked.

EDIT: I recommend you don't make enemies on the internet and you change the password on the more important accounts. I wouldn't be too concerned on the others. 400 accounts is a lot though. You should be using a password manager with that shit.