This. So very much this.
I think in some ways, it's maybe more important to know what *not* to do right now. Don't worry about shared universes or setting up the next movie. Don't even think about a sequel, just make the movie in front of you. Don't copy someone else's style or method or formula, be it Batman or Marvel, just find the strengths of *this* IP, and play to them. No Lex or Zod as the big bad guy. Don't involve people from previous failed attempts (producers, etc). And don't let the global presence cloud your judgement. The expectations people have of the character aren't something to forget entirely, but stop with the space jesus stuff! Nobody actually likes it and it makes Clark pretentious.
If I'm WB, I've finally acknowledged that I don't get this character so I'm looking at evergreen trade sales and definitive stories in the source material and hiring those writers as consultants for the duration of production. They're going to ensure the studio hires people who understand the characters as well as the brand. Once the right people are hired, the studio gets out of the way and doesn't interfere with their work.
Think my main priority would be a big budget animated theatrical release. Something to compete with the best of Pixar and Disney. Superman is for everybody, but kids especially, maybe it's time to remember that. Something whimsical, heavy on science fantasy, with lots of exotic locations and characters. Silver Age-ish, in the good ways, but not truly retro. Time needs to be spent with the familiar trappings of the character but first priority needs to be offering something the public hasn't seen before. Something to trigger a kid's imagination. Of course, I wouldn't argue with an animated Smashes the Klan, either, but I'm feeling the idea of a big animated film being pure escapism. The socio-political stuff can be for live action.
Live action, I'd like to do either a mid-budget movie or a big budget HBOMax series based on the Golden Age, Morrison's Action, the 40's cartoons, etc. Not necessarily set in the past, but it could be. In any case, a return of the social crusader who could leap tall buildings and would go after corrupt cops and politicians and also fight giant robots and apes with human brains. Smashes the Klan could obviously work here too. I'm one of the fans who believes it's time for the OG to return and I think there's a mountain of circumstantial evidence that shows it could not only be successful, but the most successful the character has been in thirty years.
Every project has a villain we haven't really seen before. Not Lex, Darkseid, Doomsday, or Zod. Not at first, anyway, though I wouldn't be averse to some being used in new ways. No kryptonite, no de-powering of any kind; if you can't use Clark at his established power level you shouldn't be using him. The focus of film making shouldn't be on the action, but adventure and the character dynamics and development. Make us care about Clark and his world and worry what'll happen to them or we won't care about the threat.
This is an odd one, but make Clark visible hurt. Black eyes, bleeding, broken bones if the story warrants it. Let him spit out a tooth. Clark has to look like he's struggling with his physical threats; you're not gonna worry about the outcome if Clark's in a fight and his hair isn't even mussed. Even if, intellectually, we know Zod punching him hurts, if we don't see it, we won't feel it.
But really, all I think WB needs to do is figure out who *does* understand Superman (trade sales/reviews will likely point to Morrison, at least), have them ensure you hire the right people to make the movie (not doing the hiring themselves of course, just take their feedback seriously), and then just stay the hell out of the way. It doesn't sound hard to do.
Alternatively, I could just cut a Sony style deal with Marvel/Disney and let Kevin Fiege do all the work.