#7 John Cena should become a Grand Slam champion and he should bring back his open challenges

John Cena was the face that ran the Ruthless Aggression era and a significant part of the PG Era. He has all the medals except one, that is the Intercontinental Championship. He never went behind it because he has always been the main event guy.
'Big match John' should add this last championship in his profile and become a grand slam champion. Stars like Roman Reigns, Randy Orton, JBL, The Miz, to name a few, have accomplished the title of Grand Slam Champion. So before the end of 2018, Cena should attain this title to accomplish everything WWE offers.
In 2016, when John Cena was the US Champion, he used to throw open-challenges, which gave an opportunity to all the young talents to compete against the 16-times champion and also to win the US Title.
His open challenges were very interesting, and the fans were very much into it. However, it stopped after he lost the championship to Alberto Del Rio. He could win the Intercontinental Championship and start his open-challenges again to entertain his fans.