I used to have a large online presence pre-Snowden leaks and was signed up to hundreds of services, some even in my legal name. Gradually I attempted to 'go dark' and delete all those accounts, which was tedious, but worth it.
There's two extremes to being online: you can wear your heart on your shirt sleeve and post under your legal name, and share details about your private life, or you can be a ghost and leave no traces, or at least minimize your footprint.
There is this thing: some people are just so famous online, that reverting back to some private mode is nearly impossible for them. They're so out there and involved with so many services, that 'going dark' for them would be very difficult, but there are steps you can take to minimize your footprint. It's not too late to take those initial steps.
I encourage everyone to attempt to 'go dark' gradually and make it very expensive for people to dox you. If you turn it into a game, it's even better. I said it was tedious, but honestly I kind of like becoming a ghost. I'm so opaque to big tech now, that it must really piss them off, including dragnet surveillance.
It's not a life for everyone however, and sometimes I have to participate in big tech like using my smartphone to do online banking, or buying something on Amazon, but 99% of my activities online are all more-or-less anonymous and private now, and I'm happy with that.