To be promoted to the next league, you must be in the top 4 or 2 positions at the end of the round, depending on the league's requirements. Your position in the league is determined by your rating.
If you meet the rating requirements of your league, you will be promoted to the next league immediately.
Players who do not finish in the top positions will either move to the previous league or stay in the same league. It is impossible to drop below the Wooden League and the Orbeuseus League.