minecraft gets boring when you are the top player, like diamond everything and 19-block wide obsidian house.
That's why you don't make your shelter outta damn obsidian, you actually make it look good. Is this after going through the nether, finding the Nether ruins, battling the Wither Skeletons, making and battling the Nether Boss, making a huge ass power pyramid with a beacon, finding a stronghold, finding the end portal, defeating the end, do all of it again.
If its so boring since you got diamond swords and obsidian houses, put everything into chests, then go out and survive, again.