You could set your browser to clear all cookies when you close it. That does mean you have to keep logging into sites every time you open the browser again, but with a password manager that's not really a problem.

gdpr is a different thing than the cookie law, refusing consent is a real thing that everyone in the industry spent a hell of a lot of time and effort implementing to the letter because the fines for companies are way too large for anyone to ignore

There's plugins that will do it for you (with the max privacy settings so you don't have to worry about getting tricked by phrasing).

I even have one on my mobile browser.

Yeah probably.

Use this: https://github.com/OhMyGuus/I-Still-Dont-Care-About-Cookies And combine it with this: https://github.com/Cookie-AutoDelete/Cookie-AutoDelete

I've set it to delete cookies on domain change.