#3 Roman Reigns
Roman Reigns was Goldberg's original opponent at WrestleMania 36 and we believe that Reigns would have won the match as well. Ultimately, Braun Strowman ended up being the biggest beneficiary of Roman Reigns pulling out of WrestleMania 36 - which was due to unfortunate circumstances.
However, health is more important than any Championship and Reigns made the right call to pull out, though we're a bit surprised at how WWE waited until the last minute to deal with it. Either way, this is the most logical feud to go with after WrestleMania 36. It all depends on Roman Reigns' health and the prevailing circumstances, but the best option WWE can go with is Strowman vs Reigns.
They had an unforgettable rivalry in 2017 where both came out looking great and Strowman himself admitted that Reigns was his best rival. The two have proved to be perfect opponents for each other and a good way to keep fans hooked during this odd time is to have an exciting Universal Championship feud on SmackDown.