These features have been abandoned but I think could be repurposed. My ideas are as follows.

Guild Leve
This would replace the current maps system. Instead of being limited by how many maps you have obtained you would be limited by how many Leve allowances you have. This limit would need to be altered/balanced but it would mean you don't need to buy a map or go and waste your time getting one yourself. You either have allowances or you don't. Once you accept a leve you can share it with your party.

Guildhests
I think this content would be better utilized by being completely replaced by solo dungeons. I think SE could get really creative in creating solo content. The dungeon would have 3 paths and it would force you into a certain path depending on the role you entered in as. They then could present unique challenges to players based off of that role.

Just some thoughts as this content seems to be taking up resources not even new players really utilize. Removing the systems seems like a waste, so repurposing them seems like the best course of action.