So another idea for some extra prizes when you win the global leaderboard can be titles. There will be premade titles and when the top 3 wins they can choose 1 title from those premade titles. The title can be like this: [TITLE] {User}. And the titles color will represent what place they got. For example if they got first then the title will shine gold. If they got second then it will shine silver.
The title can also be made of diamond for first place, Ruby for second and sapphire for third ( or any other gem for that sake)
This would be a great way for members to feel like their hard work has earned them something.