The strawhats should have a huge world map in their ship cabin, which Nami fills out as they progress through the story/islands

By huge world map, I mean a huge map on the wall, which could be located somewhere in the ship.

I think this would go hand in hand with Nami's dream of mapping the entire world. Currently, Nami and rest of the strawhats dreams are barely even mentioned. So, I believe this would be a cool way to showcase Nami's dream, while also serving as a good progress reminder.

Since the entire world is hard to map mainly due to the grandline and new world, a lot of the map would be empty initially. However, as we progress through the each arc, Nami would fill up the map with that specific island and neighboring regions. This would also further help with worldbuilding, without feeling like every information is spoon fed.