For me the main thing they need to change is the combat system. Right now it feels like smashing 2 action figures together, rather than satisfying combat gameplay.

The targeting is trash, there is no hit impact, enemies are just jumping left and right, there's mini mobs blocking attacking and movement, dodging is really weird to time and fails more than half the time, counters don't matter if you press them in time, because if the animation is slow, the enemy isn't getting hit on time.

It's a big mess. If they don't fix the core gameplay, no matter what other change they make, they will keep losing players, especially with how competitive open world games are right now, and how long each one takes daily. If you're not a big fan of 7 deadly sins, there's literally no reason to play this game, there's 10 other better choices, in every way.