Do you think you are clever? Like this ad trackers can't just switch to use local storage, fingerprinting or other methods to go around your clever solution? You can't use tech to solve this, Google, Facebook and the others will tech around your fix.
Much simpler, make tracking without permission illegal so everyone can benefit not only the tech people and the ones that can afford extra routers, VPNs or other tech solutions. Also not sure if private mode is 100% safe.
Some of the methods are explained here:
I want to be asked every time a service wants to know who's using it from my device. I want to have the option to immediately decline authorization before any information about me or my device is sent.
I want to have the option to say "no, I don't want this service to know it's me". I also want the option to say "I am <soandso>" even if really I am not <soandso>.
Not giving me that option is a disrespect of me as a user.
Please don't propose technical solutions for things that should be solved by law. Protection should be the default, and not up to your own cleverness vs. the cleverness of trillion dollar industries. If that is the fight you have to fight, you will lose either immediately or eventually (see also the next point).
Please don't propose technical solutions that are mostly ineffective due to the huge amount of brainpower spent on browser fingerprinting, super cookies and other means of persistence. Cookies were invented in the 90s, and the means of being more clever than those deleting cookies were invented soon after.
Please don't speak with such condescension about these topics. People might mistake your confidence to imply you are actually on to something, but if the solution to the problem was so simple it would have been solved already - and the industry behind this would be dead or pivoted away.