I suspect there are two possible forms of breakout growth for nostr:

1) some totally new experience that can’t be done with existing platforms (e.g. zaps).

2) appreciation of the neutrality causes some other at/sub-scale networks to opt for nostr as a way to avoid dealing with content moderation/“free-speech” goals directly

I think censorship resistance and interoperability are correct, but too theoretical for most users to care about directly.