I’m not sure what the long-term vision for the game is, but personally, it would be awesome if it was added a reputation system, along with the ability to interact with NPCs in Sacrament in more ways, a bit like in the old Fables 2 and 3, where you could eventually get married, have kids and start a family, or even betray your own family. It would be awesome to have a dog as a pet that could help with digging, like a dog, or a woodpecker to chop down trees, etc. Of course, there would also be the ability to harm and kill NPCs. If the player has a bad reputation, they could, for example, end up in prison or have their character killed if playing in hardcore mode, they could even receive a wanted poster. It would also be fun with co-op, perhaps having a player hunted down by other players to catch them? Also, if the player has a good reputation, NPCs could give them gifts, or information on secret locations or game systems, or where to find a certain special item. For merchants, the player could get discounts or “buy one, get one free” deals.
Just a personal wishlist, I don’t know if this would fit the game vision at all.
Above all, I think more side quests with various NPCs in the hub would be great, to immerse you more in the world and its characters, as well as being a way to accumulate resources and XP between the main areas, they could be paced so that the player needs a few levels from the end of the previous main zone and the start of the next main zone, at which time the player could be given side quests balanced for that point in the game, obviously allowing players to decide when to do them but simply introducing each specific set of side quests by “that moment onwards”, or maybe, player not doing them, would have the quests progress negatively or in another way and impact players reputation in some way.