I dunno I definitely find replayability in most of if not all the packs. Maybe it's my playstyle I dunno. Something like Eco Lifestyle sure getting green would be the "goal" but what about switching it up and getting all the world's to full industrial and then back to green?
Other ideas:
• A house furnished with entirely dumpster dive items.
• Rags to riches
• going to all the worlds and adding a themed community space lot. Like if you have vampires adding in a gothic/Victorian themed community space/marketplace/community garden/maker space.
• Vegan style restaurant with an emphasis on green.
• Eco friendly retail place focusing on gardening or crafts
I feel there are lots of ideas and concepts to try out and combined with other packs there is still lots of fun to be had ?