DRAGON QUEST BUILDERS 2

You complete tablet targets on the Isle of Awakening. There's roughly 9 mandatory tablet targets, and then additional ones for building lots of rooms, recruiting more villagers and monsters, selling items, building meadows, increasing fanciness, growing crops, etc. You can check the targets by interacting with each of the three tablets (green, red and blue), and see what the goals are.

I'd recommend growing lots of different crops (needed to unlock rare crops for breeding), and building meadows and different room types. You'll unlock several optional targets after each main story island for recruiting more villagers as well.