There’s not a lot to track in a single browser session. The privacy violation of tracking cookies is that they track what you’re doing. If you set the privacyguides.org recommended settings in Firefox, Mullvad or Brave, the cross-site tracking should be blocked, but deleting them completely means the site will even have to do some advanced fingerprinting to even know “it’s you” on the same site (if not using the same public IP, for example by using VPN, otherwise the IP will be recognised)