Before you reach 6 path for the first time, you will only get minimum season rewards. You will receive the large coupon rewards for climbing the rank for the first time. Your rank will not reset when seasons end.

After you have reached 6 path at least once, you will get season rewards according to your rank at the end of the season. You will no longer get the coupon rewards for climbing ranks. Your rank will reset at the end of the season.