#2 Feuds with hated heels
One way to get fans to cheer for Roman Reigns once again is by pitting him against a heel that is widely hated by WWE's rabid fans. SmackDown Live has a couple of heels that are widely hated by the WWE Universe.
The likes of Shinsuke Nakamura, Elias, and former WWE Champion Daniel Bryan, do get booed at WWE events, which could divert all the heat away from Reigns. Randy Orton is another Superstar that could feud against Reigns to get The Big Dog slowly back in the WWE Universe's favour, while Lars Sullivan, who has been called up from NXT, has a menacing look which could work well for him if he's a heel.
Charlotte Flair to return and wrestle a CURRENT CHAMPION?
Reigns could get some sympathy if WWE decides to use a leukaemia angle, even though it may rub fans the wrong way.
A feud with a top heel on SmackDown Live could tilt the fans towards Reigns once more.