Good questions. Agorists (and more broadly, anarchists) tend to not believe that their ideology needs to be widespread in order to work. Of course, it would be absolutely fantastic, but it is not yet realistic at this time in history (nor even going back to the days of early anarchists).

I think that we just busy ourselves with small-scale self employment/self-sufficiency, and voluntary activities/transactions with others who believe as we do,

while trying to minimize or avoid fiat transactions as much as possible, to the point that the greater economic picture is less important to our daily lives (though I don't speak for them all) and to keep moving forward the way we do, and only hope that future generations keep the tradition.

It is not for agorists to worry about or try to control the greater economy, but to keep up the tiny momentum of all the above in our own spaces and local communities. Nostr helps expand those into a larger community, but it's the same thing unless the world becomes orange-pilled and takes up a voluntary ideology/identity (which will hardly happen in our lifetime or even the next generations' lifetime).