Changing Important identifiers

In case I change Color depth, add fonts, change user name and hostname this will increase my anonymity and privacy or it will make me less secure ?

Probably the same principle as Tor / Tor Browser. Anytime you change settings that make you non-uniform and it can be detected, you suddenly drop into a very small subset of users.

Rinse, repeat for each detectable change. A few changes later, you’re screwed and unique. See the entries at top of wiki documentation - it’s covered there somewhere.