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

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.)
 
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