The content should be the context, primary.

But I agree that it can be improved, at least to trigger some curiosity in the user.

Maybe the top-left "What is Nostr" is too conceptually distant for newcomers, we can add something like

"Do you know that what you are reading is on Nostr, a decentralized network? Read more"

that when clicked briefly explain the background context (this stuff is a note on Nostr, that can be viewed choosing from different apps, blabla, read more about the nostr protocol here).