Some more detail to the great points provided by @ajz:

• The fediverse ecosystem and standards - the foundation on which it all stands - is evolved by the grassroots SocialHub community.
• SocialHub is unfortunately very small and needs more active participation. It makes fedi weaker than most people think. I wrote the Spiral Island analogy for it.
• SocialHub is not just for technologists, but for anyone that wants to evolve fedi into the future. There’s the Fediverse Futures where you can post.
• And there’s also the Fediverse Futures Lemmy community, which is purely for nice, delicious brainstorming and dreaming of all that’s possible.
• When it comes to apps & software you can promote, the most complete are the ActivityPub Application Watchlist and the ActivityPub Developer Resources Watchlist (they are input for Fediverse Party).