MCU: What The Netflix Shows MUST Do If Resurrected
1. DON'T Recast Anyone
Perhaps the most obvious point on this list, there would be little reason in having these characters return were the same actors not playing them.
Every one of the Marvel Netflix series had everything from their protagonists to antagonists cast perfectly. Vincent D'Onofrio IS Kingpin. Mike Colter IS Luke Cage. Jon Bernthal IS the Punisher. There's no way of getting around it.
Even the cast of Iron Fist, though initially received poorly, was well cast. Jessica Henwick and Sacha Dhawan gave audiences superb portrayals of Colleen Wing and Davos respectively, Finn Jones' Danny Rand even became greatly enjoyable once the awkwardness of the first season wore off.
The problem of actors not wanting to return is an easy one to solve: don't bring those characters back.
The whole thing is really quite simple.