Probably by inviting more outsiders to join? Although it could be hard since Spacehey is . . . y'know . . . "Sepi"-type platforms (for comparison, Spacehey feels like some kind of Indie games in Itch.io compared to popular games like Free Fire or PUBG).
However, I also think it because Spacehey is Blog-type posting forum (idk the correct terms, cmiiw) and not some "inducing short video" kinds like Tiktok or Meta Apps, may resulting in this place became too quiet