But what if the best method to save the world involves government after all?

It may well. I know not absolutes. I merely play the probabilities.

To be clear, though, my goals did not include "become a powerful politician". The goals were more along the lines of convincing lots of people that, hey, remember when people spent a long time thinking about better ways to run a government, and then founded America, and it turned out pretty good? What if we did that again, only on a regular basis on small scales, preferably non-territoriality, all of the time?

It's unlikely that I'll be able to convince a few million people to succeed from their nations (without invoking the ire of their tax collectors) anytime soon.

Perhaps there is a way you could use your old expertise on your new goal?

Hopefully, yeah. Much of my expertise is transferable between domains (resolve, passion, productivity, intelligence, etc.) -- I actually don't have much of a specific advantage in societal reform. That which I do have is trumped by the relative importance of AI risk -- sunk cost fallacy, and all that.