Thanks for the info-what would you suggest?
It’s a big subject. All you can do now is limit what Facebook can find out about you. I doubt it will ever be possible to delete or even have them reveal the true dossier they hold on you, or the links to you from your friends, family and colleagues dossiers.
As you have got rid of your Facebook page already, then you need to ensure you’re avoiding all of their main products. What’s app, insta, messenger etc.
Limit and vet apps like Twitter and stuff, if possible download and use a browser specifically for them. On iOS I use separate browsers- one for social stuff, one for finance, one for Google just in case (Firefox focus), one for shopping, and one for work. I use tor for very sensitive anonymous searches like health related stuff.
Then you need to make sure you’re using browser blockers to try to limit fingerprinting. And blockers to block tracking ‘like’ buttons and pixels etc.
Ideally you’ll use tor, but safari is already a good anti finger print browser, a hardened Firefox is also a good move, on desktops at least. It’s a deep subject though, You should investigate sites like privacytools.io and r/privacy over on Reddit.
You should be using alternatives to Google search, start page is good as is DuckDuckGo, though the latter is very US centric in its results so depends where you live. Startpage offers proxied Google results.
You should move to protonmail or similar for email, to ensure your inbox isn’t scanned at rest, and you should be using separated non identifying email addresses. One for social networking, one for finance, one for taxes and gov stuff, etc.
It’s a bit paranoid sounding, but it’s easy as long as you don’t dive to deeply into the craziness ??