Worldbuilding is not easy
Let's get one thing straight: in no way am I an imaginative person. Yet I enjoy fantasy settings to the point where I've run several RP's of my own with unique(ish?) lore, so I'm somewhat capable of doing just that: coming up with and writing about worlds that are not quite like the one we live in. However, pulling ideas out of your ass is not a particular strength of mine, which makes the whole creation process slow and arduous. And if that was the whole challenge, it'd be totally fine… Until you try to mix some realism into it and there isn't much material to pull from.