#2 Focusing on The Firefly Fun House
It's no secret that one of the best parts of The Fiend's character has been The Firefly Fun House and while that aspect of the character has taken a bit of a backseat as of late, it can return to prominence now that he is no longer Universal Champion. It could even be the start of some of the most reality bending and scary content the company has put out in years.
Between the symbolism that fills each episode of The Firefly Fun House, to the stories that Bray Wyatt is able to tell with not only words but by his impeccable nonverbal communication skills, there is a lot of room for this idea to grow in the absence of a healing Fiend.
The Fiend character is multi-layered, and the Fun House layer can really help the company figure out what to do with him next. Doing a series of Firefly Fun House segments would be a great way to rebuild the mystique around the character and get The Fiend ready for the next part of his journey.