Your individual sovereignty will only survive the upcoming era if you own the hardware like you own your brain. And by "own", I mean physically owning the thing and being able to reproduce it on your own. You need to be able to manufacture an entire custom computer from scratch with raw materials, perhaps using a miniature fridge-sized silicon fab + 3D printer home appliance, at home. Otherwise, the individual gradually becomes part of a larger organism because the reproductive locus of control for the computer is at the corporation/society level - a computer cannot replicate on its own and needs a society to build it. The human gets sucked into that superorganism by evolutionary pressures and eventually integrates. Similar things happened in the past when prokaryotes combined to form eukaryotic cells, and when individual cells combined to form multicellular organisms.
Not everyone will get sucked in, though. Evolution doesn't place all of its eggs in one basket. Some people will build robots to automate humans out of the computer production loop entirely, thereby removing integration pressure and producing at least one purely digital species. We will most likely see a variety of species emerge out of this intelligence explosion, some which augment their own intelligence using self-replicating local hardware (fabs that fab fabs, like this but smaller: https://fab2.com), and some which are wireheaded to a datacenter, with varying degrees of success at various scales. They will compete. And there will still be unaugmented humans that continue to live and die the old school way like we do today, albeit with habitable zones compressed.