The blacksmith should have another sub group where if they reach level 5 (or something higher) you can promote them to a weaponsmith, they basically make better and more efficient weapons that do more damage.
After leveling up quite a bit, they learn new recipes like how to make a bow, so you can turn someone into an archer. Maybe when they hit level 15 or 20, they learn how to make a pistol and explosives.
Addition of an adventurer also will add a whole new topic to Stonehearth. Adventuring, you can find ruins out in the wild, find all sorts of goodies and ancient structures that advance your technology and uncover a new part of the world your town didn’t know about.
What do you think?