I bought some platinum and leveled myself up to Level 14 1/2 (stuck at 200/328) and I can't seem to level up to 15, I am not getting XP for my playing. I thought the game I purchased would get me to 15. Anyway, I bought another game in hopes of gaining some XP while I play to level up - but no one is playing a game, and if they are, they are private.

So, my question is: Which game should I purchase now to level up past level 15?

Thank you!