Curate, connect, and discover
It has been mentioned in the game that before your farmer moved to Mistria, they were also a member of the Adventurer's Guild. (I believe) Then what if, your main character in Fields of Mistria used to live in Stardew Valley until something significant occurred that took a toll on them.
One day, Marlon received news from one of his old adventurer friends in the Capital about a request for help from Mistria. Recognizing that his comrade and student needed a change of scenery, he informed your MC about the opportunity of a new farmland in exchange to assist the town. After a lot of thinking, the MC (soon-to-be mc in FOM) decided to start anew, bidding farewell to their cousin, the MC of Stardew Valley, before relocating to Mistria.