I don't think you can do anything about it, anything public is going to get scraped and fed to A.I. Even if you don't consent to people using your pictures, its going to happen regardless. The best thing to do is keep private things private and assume the worst for anything you or others make public.
Doxxing is a low skill level threat its very easy, google your target's username and find information about them, yeah its that simple. All your user data is linked to your user name and profile picture. What i suggest doing is using the same tools doxxers use (sherlock) to find your long forgotten accounts and then delete them, remember to never use the same username and profile picture.
When a database leaks it will most likely contain your username, email and ip address, this information will be findable by username, email or ip address. If you ever use an account without a vpn using a vpn wont anonymize you from the service. Disable webrtc in your browser it often leaks ip addresses while using vpns also watch out for ip grabbers.
Tldr: dont use same usernames and profile pictures, vpn is 100% secure if used wrong.
Trackers are browser problem, get ublock origin. You can block trackers by changing your dns resolver i recommend Quad9 or adguard.
You don't really get hacked unless you download and open files or your accounts get recovered by someone sending all your information to customer support pretending to be you.
Upload a keepassXC vault to a cloud service like drop box. I have an encrypted version of my 2fa authentication config file in my keepass vault. If i where to loose everything i could recover logins. Remember Never upload a unencrypted file to the cloud!
This reminds me of a lemmy post where someone was talking about attempts to fuck the gdpr (It's probably nothing) but its worth checking out before you switch your email provider
https://lemmy.ca/post/41706496
I don't think you can do anything about it, anything public is going to get scraped and fed to A.I. Even if you don't consent to people using your pictures, its going to happen regardless. The best thing to do is keep private things private and assume the worst for anything you or others make public.