Just keep leveling those four stars. Once you get a good couple of maxed 4s, you can start negotiating for your first fresh 5*. Also it helps to never ever use TEs or Pots. Save those up, because they're the primary currency of Fantasica. It takes time and diligence, but this is really the only way to get 5 and 6* cards without spending real money on the game. Hope this helps!