Okay, let's be honest. The Nether dimension is kinda boring. Sometimes, finding Nether Fortresses and getting blaze rods is just a chore. What I'm trying to say is there isn't much to do. First of all, we could add more biomes. The only biomes in the Nether right now are soul sand and no soul sand, with the occasional gravel in some areas. And those don't even count as biomes! There could be new blocks added, and entire biomes made out of them. I personally think that a biome where withers spawn naturally is a good idea. And if that seems farfetched, maybe Mojang could just add weaker Withers, similar to the Wither Skeletons. Also, If the end gets End Cities and End Islands, I think the Nether could get a form of Nether Village, similar to the ones in the overworld. I know that the Nether should represent a hellish landscape, so maybe the mobs that spawn in the villages could be neutral, like zombie pigmen, and only attack you if you attack them. Also similarly to villagers, they could trade with you, but instead of emeralds, they could trade rubies (or rupees). And before I go, one more thing. The Nether could use it's own tree. But maybe instead of a tree, it could resemble a nether wart. The materials from this plant could be used to craft Nether Wood tools and Quartz tools, where Nether Wood would be similar to the overworld wood, and quartz would be similar to iron. But, these new tools could specialize in the Nether, dealing extra damage to mobs that spawn in the Nether, or just mining Nether blocks faster. But instead of staying with the regular format,they could have entirely new sprites and names. I think "Nether Wood Scythe" and "Quartz Hatchet" sound cool. I know that was a lot to take in, but this is the update I have wanted in Minecraft for a few years now. I have no idea if you'll love it, or if you'll absolutely hate it. But what I do know is that it will greatly benefit Minecraft.