If you think Gmail passwords have been exposed, act now and follow these steps in order to secure your account and reduce damage.

Change your Gmail password immediately. Use a strong, unique passphrase (long, mix of letters, numbers, symbols) that you don’t use anywhere else. If you use a password manager, generate and store a new password there.
Turn on two-factor authentication (2FA). Prefer an authenticator app or hardware key over SMS for better security. Make sure backup codes are saved in a safe place.
Check account activity and signed-in devices. Review recent login events and locations in your Google account security settings. If you see unfamiliar sessions, sign them out and remove access.
Revoke third-party app and extension access. Go through connected apps and remove any you don’t recognize or no longer use. Revoke permissions for anything that looks suspicious.
Scan email settings for tampering. Look for filters, forwarding rules, auto-reply messages, or mailbox delegation that you didn’t create — attackers often set these to intercept mail.
Secure linked accounts. Any service that used the same Gmail password could be compromised. Change passwords on banking, social, shopping, and other important accounts. Prioritize financial and identity services first.
Run antivirus/anti-malware on your devices. Make sure no keyloggers or malware remain. Update OS and apps to the latest versions.
Check for phishing and fraud. Be extra cautious with unexpected emails, links, or attachments. Don’t enter credentials on pages you reach from suspicious links — navigate to the service manually instead.
Use breach notification and monitoring tools. Sign up for reputable breach-alert services and consider personal credit/identity monitoring if sensitive data was exposed.
Notify affected contacts if necessary. If attackers used your account to send phishing or scam emails, warn your contacts so they don’t fall for malicious messages that appear to come from you. A short message like this works: “My email was compromised. Ignore any suspicious messages sent from my address since [date]. I’m taking steps to secure the account.”
Report the incident to Google and relevant authorities. Use Google’s account recovery and abuse/reporting channels to flag unauthorized access. If financial loss or identity theft occurs, contact your bank and local authorities.
Harden future security: use a password manager for unique passwords, enable 2FA on all important services, minimize reuse of recovery email/SMS where possible, and consider a hardware security key for the accounts you can.

Quick checklist (copy/save):
• Change Gmail password — unique & strong
• Enable 2FA (authenticator or hardware key)
• Sign out unknown devices & review activity
• Revoke suspicious app permissions
• Check and remove malicious email rules/forwards
• Update passwords for linked accounts (financial first)
• Run malware scan on all devices
• Warn contacts if phishing was sent from your account
• Report to Google and banks; consider identity monitoring

If you want, I can draft a short message you can send to contacts warning them about potential phishing, or provide a ready-to-paste secure password format and recovery checklist tailored to your situation. I cannot help recover or find leaked passwords, but I can guide you step-by-step through securing accounts.