#2 Spend months building toward the match and make it personal
WWE was able to make the match between Roman Reigns and Braun Strowman feel worthy of being held inside the Hell in a Cell because the two men spent months trying to destroy each other.
They did things to each other that could possibly kill a normal human being. So when they stepped inside the Hell in a Cell last year, it felt like they were supposed to be trapped in there together.
When Seth Rollins and Dean Ambrose clashed inside the Hell in a Cell in 2014, it was a few months after The Architect turned on his Shield brothers and became a nefarious lying, cheating, heel. They spent months at each others' throats, so having a Hell in a Cell match was the culmination of a big rivalry with a lot of bad blood between the two men.
The Usos and The New Day had the hottest feud in WWE (especially in tag wrestling) in 2017. It escalated to violent levels, both physically and verbally, over the course of months. It led to the first-ever Hell in a Cell match for the tag team titles, and only the third-ever two-on-two tag team match inside the giant structure.
It made sense to do the match inside the Cell, and it came about organically. Undertaker's match with Triple H at WrestleMania in 2012 and the Lesnar/Undertaker Hell in a Cell in 2015 were also fairly sensible.