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Kireina has been guessed so easily! But it was rather obvious what she wanted to do at this point, fusing the entire world of Genesis into her Divine Realm and then remake the world back to a planet might sound tempting! Although just fusing it into her enormous divine realm was good enough already for her.
Having an enormous world inside of her divine realm was already reality with her current one, which was so gigantic that she could easily Isekai some people into it and they would never find out this world is inside her soul unless someone that knew were to directly tell her, but many of the mortals didn't knew, in fact, and thought they were just moved somewhere else in the world…
At the end, even Jupiter had assumed something like this was a great possibility.
Kireina was too easy to read sometimes…
Check "The Protagonist's Sister Is Actually the Strongest"!