post-ender dragon fight items

Sorry if this is considered a list of ideas, but i see it as a singular idea that'd had wide reaching effects.

a big issue with modern minecraft is after you beat the ender dragon nothing changes. the world doesnt get harder, you dont get any new items, and it's the same game except you just beat the ender dragon. this causes players to get bored if they cant figure out other things to do like building things. so far after the ender dragon you get 3 new things, the shulker, elytra, and a few new blocks (also the dragon head but that's more like a neat thing than an impactful feature). so i suggest that after you beat the ender dragon, mobs can drop new items, like creepers dropping a creeper charge, or spiders that drop webs that you can used in a cross bow like a grappler, and many more. these items will only drop after you beat the ender dragon, and will still be rather rare drops.