Worldbuilding for a new series

I'm writing an epic fantasy series, and like a lot of writers, I've spent way more time on the worldbuilding than on the actual chapters. I have my protagonist, his arc, and a handful of supporting characters developed, but the world itself has really taken on a life of its own. I'm doing everything I can to make sure it doesn't feel like just another recycled version of other popular fantasy. I want it to be something unique and genuinely captivating.

Lately, I've been thinking it might be fun to create a community around this universe as I build it. Not to hype it up or sell anything, but to get honest feedback from people who love the genre. I think it could be helpful to shape the story alongside readers who care about this kind of work.

So for those of you who know the landscape better than I do, what platform would be best for that kind of community? Reddit, Discord, X, Facebook, or something else? I'm open to ideas and would love to hear what you think.