Okay, so after this new update I saw that either
1: the devs rebalanced the game for worse (I've noticed that the enemies have either more health and defense or they made the characters weaker) or
2: they have stealthily been making the game P2W (Pay to win) cause I really struggled with the arena's objectives in medium with my strongest character (Sakura lvl60 with all stats at 21) and noticed that she's way slower both attacking and moving (。>﹏<)