Yubikey, always on vpn, use mullvad browser when not logged into anything.

Mull on the phone, always on vpn.

For logging into services use different chrome profiles, one set of cookies per profile in chrome.

Keep the phone in airplane mode, with wifi on, as much as possible use randomized mac address. Uninstall apps not in use.

Pay for as much as you can using cash or monero http://kycnot.me