If I delete the site's cookies in the browser and turn on the proxy, will the site be able to identify me?

Question

Browsers

Avito for example. He will essentially see only the same user agent, but the IP address will be different. And according to the history of visits, he will not be able to identify me?

Answer 1

There are many other ways.
In general, this is called: browser fingerprinting , and the most famous example in Runet is evercookie , but there are other articles in Russian
https://www.google.com/search?q=habr+fingerprint
If you need anonymity, then read about whonix, tails, tor-browser and all that.
You can test your browser here:
https://panopticlick.eff.org/
https://amiunique.org/
https://browserprint.info/
https://browserleaks.com/

Answer 2

How to make the site not detect a computer (not IP)?