For those foolish enough to put their main (or a heavily used) email address at every Tom, Dick, and Harry site, may I suggest you look into disposable email addresses.
Just for the places I trust, I have at least 15-20 email aliases (based on who they are such as friends, financial, government, businesses I often deal with, medical, places I volunteer at, non-profits, etc). Then for everyone else, I use individual disposable emails that route messages from that site and forward them to yet another alias. I use hundreds of these and I can autofill one into any new site at any time with a few clicks. Each one can be temporarily disabled or permanently removed upon receipt of an email from that site with two clicks (delete then confirm) or by going to the privacy site and selecting those to disable/delete.
I don't even give my real email address out to my friends - just another alias reserved for friends I know. The only one that has the real email is myself and my mail provider. For $3/month they give me full privacy and no ads.
I also use an ad blocker, a VPN, and I open all sites in private windows then close them before going to other sites unless I need to be logged in to both simultaneously in which case I use individual private tabs. Even then, I clear cookies on any Youtube/Google/yahoo site constantly even while they are in use.
I use no social media and block their cookies.