If you try to fight against advertisers and privacy-invading trackers and malware alone you will always lose. They are huge companies. They bribe your computer manufacturers to auto-install malware. They infect your operating systems. They have CAs. They have millions to spend on thousands of brilliant engineers who will work around anything you come up with to attack your security and privacy. An answer must be feasible for almost everybody so that we can all enact it collectively, technical or not, or it is no answer at all.
However, I strive on such insecure channels to be very uninteresting. I restrict everything that's potentially controversial to channels that are more private and anonymous, using VPNs and Tor. I share about that stuff with nobody who knows who I am in meatspace. And vice versa.
So it's not that I'm "cut[ting] [my]self off from all of society". But I am revealing different aspects of myself to society through channels that would take considerable effort to link. That is, I compartmentalize.
I realize that I've gone to extremes. But for me, it's mainly become a hobby. Or rather, LARP. Still, anyone can start compartmentalizing. Just get a used low-end gaming machine, install Linux and VirtualBox, and learn to use VMs. Run a VPN client in the host, and learn enough iptables to lock it down. Run Linux VMs with other VPN clients, to get nested VPN chains. Run Whonix VMs to connect via Tor.