Hello! Just like Bogotor said, you c*e your free points from events to redeem power-up items instead of getting ninja frags. One of the best items to redeem is Training Potions, it is basically one of the regular items that usually shows up in events weekly. You c*so redeem items like Ninja Assist Optional Pack, Myoboku Cultivation Pack and other items that can give power boost. Personally speaking, that's what I'm doing, the only thing that I always redeem are power-up items and only selected ninja's frag (Naruto [Sage of Six Paths] and Tobirama Senju [Edo Tensei]).