Minecraft i have nothing to do?

I have this one world i have a castle all done on survival all the resorces i would ever need although short on diamonds but i have pretty much mined the world out i have a nether portal a enchantment level 30 and an xp farm a slime spawner and everything the onlything i pretty much havnt done is defeat the ender dragon with i'm going to do i will have nothing to do after that. Any ideas? Btw its xbox 360 edition

Play multiplayer with friends! Build some epic projects, etc. That is the beauty of Minecraft. With friends, the possibilities are endless.

Your screwed. AND you win. *claps*

You go out and enjoy life instead of living behind a screen