As now I officially have 1.5x the number of followers than I had on Twitter.
From literally day 1 I have more engagement here, than I ever had on Facebook even with ca. 10x the number of "friends" over there and having my profile and posting (albeit irrerularly) for over 14 years.
To me, Nostr is a success right now. It may get bigger and better over time, but if it stayed exactly the same as it is now, I would still be happy.