Short and sweet:
Something other than a stockpile to store large amounts of veggies. Like a granary but for veggies.
Maybe a wind powered loom?
Stoneworking. Chip stone>shape stone> use stone. Like for a variant of walls and buildings.
a place to store freshly chopped down tree logs. Like it could have an inventory just for logs, to keep things tidy.
Since we have metal working, time to step up to lumber milling! build the building, then add the machine and it would give more uses to iron.
those are some of the ideas i was thinking of.