Wild vegetables are also food. For serfs, wild vegetables can be considered as a main staple. They are almost included with every meal, and there isn't enough even for personal use, let alone for making dried vegetables.
Fishing in the sea is nonsense. Even if someone actually managed to get a boat, sending a group of landlubbers to fish is not a reliable idea.
Moreover, the sea isn't peaceful in the Magic World. In the vast ocean, there are countless dangerous creatures.
Fishermen have always been one of the riskiest occupations. Almost no one would be willing to risk fishing on the sea if they can farm on land peacefully.
The real path for everyone is to rent out labor. Food and cloth can't be grown overnight, but the yield of a mine can be elevated in a short period of time.
During war times, iron is hard currency. Whether it's raw iron produced or forged weapons, they can be handed to the Governor's Mansion.
