In Fairy Tail: 100 Years Quest, Natsu, Lucy, Erza, Gray, Happy, Carla, and Wendy all go to Edolas again. How do they get back to Earth Land?
They devise a plan to get back to Earth Land with the help of a dimension-travelling Elentearean Exceed (Elentear is another parallel dimension, a magical one, unlike Edolas) and by consuming the last of the X-Balls in Edolas (X-Ball is a medicine that allows denizens of magical dimensions to retain their natural ability to produce magic while in Edolas, see Fairy Tail chapter 180).
The plan is disrupted by Dragon Goddess Selene, who decides to teleport them to Elentear for her own amusement.
Eventually they'll come back to Earth Land from Elentear with the help of the local mages.