No one's investing or expecting a return on a million dollars in investment with it. It's already a W3C standard. One popular piece of software (which you dismissed) supports it. Other promising attempts like Plume (blogging), Pixelfed (image sharing), and Aardwolf (Facebook-like) are in development. They're already revenue neutral (or better) from the Patreons and Liberapays that provide their funding.
From that perspective, your thing is just another closed-off ecosystem that doesn't talk to any other. Open source is not sufficient when we're talking about social media software. My new social graph is growing, and it's not dependent on someone expecting an ROI.
I understand you started this project before ActivityPub was a thing, and before anyone took federated social media seriously. But that's the hazard with starting early: sometimes something comes along and forces you to change how you think.
You missed the boat, and you don't realize it because you're busy building a yacht that holds smaller yachts. It's a nice yacht, but I like the growing network of party barges I'm on.