>IP are also constantly changing, at least once a month.

I don't know from where you have that one sided information (maybe you life in a bubble), but my IP changes never until i leave the router powerless for more then 12 hours.

>An ad blocker already eliminates you to 40% of the internet users, which is a lot.

No it's not, but your screen-resolution combined with GPU combined with OS combined with Browser(Version) combined with Cam/Mic combined with ~location is.