2- Use Firefox Quantum and deactivate WebRTC.
3- Install following plugins on Firefox (NoScript, uMatrix, RandomUserAgent, Ublock, CookieDelete, HTTPS Upgrade, Decentraleyes.
4- Use a search engine that doesn't sells your data, or at least sells it for good actions.
5- Use an encrypted way to communicate (Telegram, Signal,..). Whatsapp(Facebook) is probably selling the data before encrypting.
6- On smartphone, I use the Brave browser, best one so far.
2- Search for emails of account creation with keyword like "Confirm email", "new account", etc.
3- Log to these accounts, modify all the informations with fakes one. 4- Delete the account afterward.