The ranked series

Two weeks before the end of the season, a new mode unlocks: "Ranked Champions Series." This unlocks a separate mode tied to your ranked rank.
When you start a Ranked Series, your rank is locked at the start of the mode, and you must complete 15 matches to earn various rewards.
These rewards include rank-specific shoes (with trails matching your rank's color), more detailed seasonal t-shirts, seasonal shirts, a seasonal hat, celebrations,
a special seasonal ball tied to your rank, and more.
Of course, since the rewards are very tempting, the mode would recommend playing with a team of 5 players to maximize wins.
We would still earn seasonal rewards, but they would be more stylish base kits.