In real life, seasons come and go; each end bringing new beginnings.
Likewise, each season's end in House Flip will usher in a new set of goals and rewards. This means, once you collect all of the goals in each city, the goals and rewards will reset. But remember, once a season is gone, its gone for good. To collect all of the Color Swatches available for the season, flip to all of the goals and collect those Mystery Crates!