#4 A tournament to determine new #1 contenders for the titles
Because of the ongoing Coronavirus pandemic, WWE might not want to risk The Miz's health. They might give the champions some time off the TV, and the best way to do that is by having John Morrison appear on the SmackDown after WrestleMania. He would then discuss how the champs have overcome every challenge they have faced so far.
And then, he would declare a tournament to determine the new #1 contenders for their championships. There are many tag teams on the Blue brand. Hence, the creative team could book a long tournament for this purpose. This move will not only provide The Miz a much-needed break, but it will also keep all the tag teams engaged.
The New Day would be one of the participants in this tourney. As they are one of the premier teams on SmackDown, they should at least reach the finals of the competition. WWE Creative should then make the best decision for the finals, but this way, they could keep Kofi Kingston and Big E busy doing what they do the best.