Why am I still being 'tracked' or 'analyzed'?

I have a suite of cybersecurity extensions which pretty much scrounge every inch of the internet I can find to chaff and hide footprints.

Yet I still see strikingly relevant ads or content that slip through somewhat occasionally. It's particularly the sponsored stories which make me go "wait a minute... it's like they know something". I figure it's AI algos at work.

I really prefer my privacy to be absolute. Is that impossible?

I have a LOT of extensions. More than ublock origin and privacy badger, it's getting to the point where I don't even know if they're possibly contradictory with each other sometimes (You can't use some of the tracker blocking exts with other similar ones). I use a bunch of email tracker blockers, 'trackmenot' which spoofs junk search results, Disconnect, and Disconnect Facebook pixel tracker.

What else can I do about this and is there an easier or more comprehensive way?

Thanks.