I thought I would respond to your comment here, so I didn't tell everyone what I was planning.
I was thinking of having Y/N go against Seth Rollins at the Royal Rumble for the United States Championship with Y/N tearing his MCL and ACL during the match. (Ligaments in his knee.)
Y/N was about to win when Triple H (Special guest referee pedigreed Y/N) handing Seth the win and the United States Title.
Y/N would verse Triple H in the main event of Wrestlemania 36 in an unsanctioned match but if Triple H lost he would have to retire if Y/N lost he would have to leave WWE.
If Y/N wins at Wrestlemania he would rekindle his feud with Seth Rollins once he was cleared to compete after Extreme Rules but first, he would screw Seth over at MITB.
He would compete against Seth Rollins in another two matches.
For example, at Extreme Rules, it could be an extreme rules match between the two. At Summerslam, it could be a Hell in a Cell match to end the trilogy with Y/N coming out on top.
(Rey can have his eye taken out at Backlash instead of Extreme Rules.)