I know I can't completely stop any large corporations from collecting or using data about me, but I pursue a stubborn, swiss-cheese/defense-in-depth strategy to reduce the data anyone has on me to a minimum.
This means I have a dumb t.v., don't pay for streaming services, don't like or subscribe to things, have a non-standard encrypted email, have a non-standard phone, computer, browser, don't use AI powered suggestions if at all possible, and on and on.
It means a lot of minor inconveniences, basically.
EDIT: I just realized this probably counts as tech. Oh well.
It's nothing fancy. Just rooted, and I have fewer Google apps, use open source apps through FDroid when I can, etc. I've also paid it off and I'm trying to make it last as long as possible, although that's more of an experiment in being a cheap bastard than privacy.