Suggestion: Lunar Phases
The suggestion of cycles can feel quite mundane if not done properly, but it can seriously work. I like the idea.
This is such a simple idea bit I can see something like this moving players around the map. I for one would log on look for the zone’s in the dark phase and go there. Hopefully other like minded players would do the same so we could all play together.
Toss in some dynamic weather and you’re golden. There’s a QoL addition I’d love to see.