Good question. You would need to start by changing all your account passwords. Next export your 2 factor auth codes. Import your auth codes in a good open source auth app. Then, one by one set new auth codes for your accounts.
This should be sufficient to protect your online accounts.
The breach was because of an unsecured API endpoint. No actual auth codes were leaked. without 2FA the attacker would just need your password and email to get account access.