For several years Hell has not been touched by the developers and it feels very empty, and there are not many things to do there compared to space or the Normal world… I know it’s hell and its atmosphere is like that but it wouldn’t be bad to improve it.
One of the new Biomes that could be added to Hell would be the Fire Tree Forests (the ones that generate there) these Forests would have quite a few Hell Trees and could also bring: New Flora and Fauna, and new ambient sounds.
Another new biome that could be added would be the hellish peaks, these would be small mountains with a small diameter but would have a somewhat long height in the shape of a point, in simple terms, It would be like the generation of Ice peaks in Minecraft but without being made of ice obviously and being made of stone and lava instead.
And finally, the Crater Biome, would be a biome composed of craters and in some of them there could be lava, ruins could also be generated near these.
These biomes may not sound like the best in the world, but they would add more atmosphere to Hell and make players want to explore it more.