My loose opinion (no data or facts to provide) is that Nostr is mostly a monoculture. If you deviate, you either become unpopular at worst, or just unnoticed at best. There are a handful of popular people from that monoculture who came here from Twitter and now dominate. If they don't boost you, you're probably going to have a very small sphere of influence.
I think this causes a feedback loop to makes it harder for Nostr to grow. Creatives who have little or nothing to do with this monoculture have little reason to come (who would they talk to), and so do the people who typically consume their creations by extension.
I think the long term success of Nostr will probably require some solution that is totally separate from the Bitcoin and Nostr communities. I don't have an answer for this since most of it's early adopters and builders come from Bitcoin and adjacent topics. It's kind of the same problem. How do you attract outside builders who want to build for people who care about more than Bitcoin and Nostr? Ideally, time will relegate these topics to the fringes since most people will use them and have no idea or interest in the tech. That's not the case now, so any other topic or person is bound to get less attention unless they post things that riles that community up. And then this is a negative incentive, in my opinion, which leads to toxicity and contributes to the aforementioned feedback loop.
I bet nostr:nprofile1qqsph3c2q9yt8uckmgelu0yf7glruudvfluesqn7cuftjpwdynm2gygpp4mhxue69uhkummn9ekx7mqpzpmhxue69uhkummnw3ezumrpdejq0mz6zs has thought about this to some degree.
