Help

I need help finding a manga, but it’s been so long that my memory is a little blurry, but basically, I believe it’s about this guy and how he reincarnates into a fantasy world or something similar (I forgot), but I specifically remember a manga panel where it’s a picture of a floating kingdom with chains, and I believe it said something about how in the future they (the MC?) were going to rule a large kingdom with demons and monsters and become a big nation, and I know for a fact that it’s not the one I reincarnated as a slime manga anyway I’ve been searching for a while, so my memory is not great.