If you're looking for something to replace Rapid, you might want to check out Stream, which is designed to build social networks, activity feeds and chat apps. It's got a rich API and SDKs that can be used in a wide range of apps, though, so it could be useful if you need a scalable, reliable foundation for interactive experiences.
Another option is Fedica, an all-in-one social media management tool. Fedica uses AI for analytics, scheduling and engagement tools across Facebook, Instagram, LinkedIn and Mastodon. It can help you keep track of engagement, map followers and monitor brand mentions, which could be useful for building a community and managing your social presence.