While online I wear sunglasses, even at night.

I'd like to put welding glasses on the darn tracking scripts...
But hey, let them follow me... I'm mostly in divestiture mode at this point so marketing stuff to me is pretty iffy. If Google is hellbent on tracking my occasional Amazon pantry re-ups, I wish they'd text me before I check out the order, and just remind me that once again I have forgotten to get more organic diced tomatoes. Dear Google: enjoy the free data via this social media post in case you missed it in my trove of emails.
I do use a password manager, don't duplicate passes across sites, and I do use Noscript to keep the tracking scripts down to a dull roar.
I don't mind ads but I loathe the trackers. I must be doing something right because I get pitches for stuff I can't afford (luxury cars) and stuff I can't use (live chicks shipped right to my rural porch that sometimes hosts a stray cat).
When I use a new app or set up a new piece of gear, I go through the setup options completely and opt out of stuff that defaults to sharing data, or I narrow it down to what I want. I wish everything like that defaulted to opt-in...
When friends ignore my requests to stop forwarding me dodgy chain mails with beacon-laden images and links to god knows what, their stuff heads direct to Junk Folder, and then I give them a throwaway email address if they can't resist forwarding me stuff their demented cousin sends them.
That and taking advantage of any "middleman watchdog" measures offered by using service providers like Apple Pay, PayPal etc. -- stuff like one-off tokens instead of revelation of an actual credit card number-- are about it for me on security and privacy measures.
Bottom line, as I'm sure others have said, if you want 100% privacy, go live off the grid and walk into town with your pile of US bank notes and your penny stash once a week to get your chow list refilled.