For example, use a password manager, use 2FA.
Password manager, 2FA where available (these for security more than privacy). Firefox with ublock, noscript and privacy badger for browsing. PiHole for DNS using standard block lists to remove adverts and trackers.
Just a password manager. Not necessarily for security, but mostly for practical reasons.
Also using Linux, but that’s not the main reason.
How does a password manager or 2fa do anything at all to protect privacy?
Security is related. With a password manager you don’t have to worry about credentials from one site being used on another.
I give a fake phone number to companies who ask for one. I also often sign up with temporary emails when possible.
Avoid using cloud services as much as possible, self host FOSS alternatives instead.