Diversity of content is lacking at the moment. (Or maybe there is no depth to the diversity.) Users joined and get bored with seeing the same topics and memes dominate the feed. And they leave. 

I suggest some budget is directed toward incentivising people to consistently post short-form / micro-blog good content that is not cryptocurrency focused. (I am not against cryptocurrency, but it is still a niche topic.) Do this until we have a level of critical mass for diverse content.

How do we know when we reach the critical mass? Maybe set a target for number of MAUs that you want to reach? Personally, I prefer not to have a certain target, but to set a time limit on the incentivisation and measure the impact. MAUs before vs MAUs after. Then adapt the incentivisation and repeat. {MAU: monthly active users}

The impact of this approach will take time to show sustainable result, but this might be one of the flywheels that can sustain growth. From HubSpot: "With the flywheel, you use the momentum of your happy customers to drive referrals and repeat sales. Basically, your business keeps spinning."

And maybe slow down adding more and more to the protocol? Let all nostr clients and relays to be on par with each other on most of the NIP implementations. Big parities in NIP implementations affect user experience noticeably. {NIP: nostr implementation possibilities}

Another bonus is that when the apps are mostly at parity with regard to NIPs, they can invest their development energy on improving their apps user experience. Better user experience feeds back into the flywheel above.