I think that "world level" should increase based off of how many bosses and enemies you kill (like in Breath of the Wild or Tears of the Kingdom (some may not have heard of this- it's a hidden number)) because spending juice to increase world level instead of stats would make people avoid doing it (so that they can just get super overpowered and pwn everything in sight instead of actually gaining difficulty). I love how this whole thread is basically everyone just suggesting mechanics from different games.