Just don't use your real identity in the first place
This!
I use 100% fake identities on the internet except for personal, secured financial sites. Even then, those are pinned to an encrypted, anonymous email service. Most of my identities are created by one of the fake identity creators online such as;
Get a whole new identity at the Fake Name Generator
Also, once a year I do a privacy audit on myself and the family and make adjustments as needed. Most sites remove my information when I fill out their privacy request form. Some sites require me to send them a letter, other sites require my attorney to send them a letter. Nevertheless I take a few hours a year to do this. I even had Google remove my entire street from street view by working with neighbors.
I have a link stored with almost all of the instructions for removal from most sites, a good many provide 1-click-removal of data. Also I called our county to opt-out of public data dumping on their websites, something most people don't realize you can do. I also do things like call Costco HQ and opt-out of 'partner sharing' of your shopping data. I don't join discount clubs, coupon clubs, store shopping cards, none of that nonsense.
I can't stop ALL bleed of data, but I can try to limit exposure/damage, which is the mode I work in.