It's not Worldbuilding. It's fictional fantasy that uses a misleading title. I tried to pose a question based on reality, and was told this is a fictional site that is more about Hobbitworld Building. That said, it should be under Fantasy. It's very misleading. There are other titles that could apply but Worldbuilding is very misleading. See the latest posts under it. Not just mine either.
I'd like to take a leaf from one of the comments to your deleted question and post a link to the Wikipedia page on Worldbuilding. The definition there offers a broader understanding of the term, for instance "Worldbuilding often involves the creation of maps, a backstory, and people for the world". These are all things which we answer questions about here.
It looks like your deleted question wasn't actually a question, that's why it was downvoted. If you actually wanted to literally build a planet, you could probably ask about that, and if your question was suitably constrained it would probably get upvoted and receive good answers. We have many such questions.
And I think you're taking Tolkien in much the wrong direction. The world he created may have been fictional, and contained some fantasy elements, but it was also constructed using knowledge of ancient cultures and stories. Middle-Earth is a world built with care and filled with intricate detail; there are many people who know more about its geography, history, or cultures than they do about those of their own world. This is why Tolkien is a great model for what we do here at Worldbuilding: because even though the world he created was full of fictional fantastical Hobbits, it still obeyed some fundamental laws that readers could understand and associate with. Middle Earth makes sense, and it has life and meaning beyond any one story that takes place upon it. This is what we strive for here, worlds that feel real and immerse the audience. We ask how to build such worlds, and if that's not called Worldbuilding, then I'd really like to know what it should be called.