I went on amiunique.com, and it says that I’m unique.
Lowest scores: list of fonts JS (0.01%), canvas (0.00%), media devices (0.00%), user agent (0.11%), and audio data (0.80%)
I use Linux Mint Debian edition, Librewolf browser, and Mullvad VPN. How do I become less unique?
Both should if your goal is to not have a reusable fingerprint (which for a privacy focus would be). Server should change more frequently since it has access to less information about the browser. Server based fingerprinting is fairly unreliable, client side uses Javascript to generate more bits of unique data.