Does anyone have any Minecraft project ideas?

I started a Minecraft world in 1.16.4 with a friend 2 weeks ago and we're already quite far. We have also achieved everything we wanted to do so far. The problem is that we don't know what else we want to do and I don't want to give up the world. So I wanted to ask if anyone has project ideas for us that are neither too big nor too small. We already have an underwater dome a beautiful house are Full Netherite have Elytres and an iron farm. I would be very happy to receive ideas.

Do you have a villager trading hall? So trade enchantment books with librarians and villagers swap for crops emeralds? Ne XP farm in the end is extremely useful too.

Wither Skeleton and Gold Farm.