The franchise has a problem in that Jack Sparrow is the most popular and headlining character, but he’s awkwardly placed if treated as the overall premier lead for a movie. Will and Elizabeth provided a balance they can’t quite replicate yet; Stranger Tides had an anemic replacement, and while Dead Men Tell No Tales did better with Will Jr. and Ms. Barbossa, it still wasn't quite enough.
And funnily enough, I’d argue that Geoffrey Rush as Barbossa was the strongest part of both those films.
They need some new, compelling co-leads. I wouldn’t mind seeing them take the idea of Norrington from Dead Man’s Chest (disgraced but exceedingly competent career navy man) and trying to rework that into a new ally for Jack; really go for the biggest possible contrast you can, and give him an air of intensity and danger to compete with Jack’s unique type of danger.