Before the protest, I completely scrubbed my post and comment history.
For the blackout itself, I closed the browser tab, uninstalled Infinity, and blackholed Reddit's domains on my Pi-holes.
After the first couple of days of the blackout, once the admins started seizing control of certain subs and booting out the mods, I went back and deleted my account.
Finally, I re-blackholed Reddit's domains, and also added them as an exclusion regex to my Whoogle searches, so they don't even turn up in my search results.
Fuck those cunts. Not one more bit of data from me again.