Adopt a manager to store unique passwords for every site, reducing the impact of a single leak.
Turn on Two-Factor Authentication (2FA) for your Gmail and all major accounts. This prevents access even if an attacker has your password. Adopt a manager to store unique passwords for
Use trusted tools like Have I Been Pwned to see if your email has appeared in recent dumps. change them immediately to unique
If you reuse passwords across sites, change them immediately to unique, strong passphrases. Adopt a manager to store unique passwords for
Datasets titled like this are often "combo lists" compiled from hundreds of historical breaches and "infostealer" malware logs.