Switch So I'm almost done with my classic single player world, what should I do next?

[Log_shot_gab]

I beat moon lord, I made the zenith I have endgame armor, I've done all achievements.
What should I do?

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[Arlwiss]

Purify the world, get into making teleporter hubs and railways, build the NPCs more glorious houses...
Or if you want to try out a new world, but something a bit different, maybe try out the constant's world seed - Secret world seeds - The Official Terraria Wiki

 

[mathbrush]

I agree with the above suggestions. Also, Expert mode is a fun challenge once classic gets easy. If you're not there yet, one way to prepare is to beat the game with each class on Classic (ranger playthrough, mage playthrough, etc.) because it helps you get familiar with all the bosses and weapons. Then, once you're an expert on classic, you move onto Expert, which I think is genuinely more enjoyable (more accessory slots, new boss drops, bosses act differently, etc.)