To automate the leaderboard reset process:
Log in as an Administrator to your account.
Click on the menu bars in the top-left corner.
Select App Control (1).
From the left-side panel, click Gamification (2).
You can set your reset cycle to occur every week, second week, month, quarter, six months, or year (3) on the day that you want (4).
View when your next seasonal leaderboard reset is scheduled for (5).
Click Save Changes (7) for one group, or Apply to many (6) to select which groups should be affected from these settings, and Save Changes when you are done (7).