Ok so, goingby whats built and what isn't, we need
A brewery, an Aviary, likely a fourth Bathhouse given how fast our numbers are growing, the Sewers once that building is unlocked for next turn, and more than likely several new Inn's and Stables. The inn's because we could definitely do with more, and the Stables because we have two herds and barely enough stables to make mounted troops worth the effort.
After that possibly a small pier and small dock, unless having the medium version of both makes the smaller version irrelevant.
Oh! Also also, i would love to invest in getting both the highest quality housing, and a few Noble Manors plopped down to see what having nobles actually does for us, and possibly allows our mc and her teacher to move out of the lighthouse.