I guess nothing really specific, just some thoughts as I'm turning the corner into the Sanderson books.
I like the Perrin arc in the early books, and the Wolf Dream and stuff is fun. We're in this magical world, dreaming is different, and there are different ways to access those dreams. It's also a fun take on wolves. However, after the first few books I'm not sure how much it adds, and the whole character of Perrin could be re-written to remove the wolves and I don't think much would be lost.
I never really liked the Padan Fain story arc and never thought he really added anything. I have to wonder if he was kind of an in-between before the idea of the forsaken really took off, or what. Mat can have the cursed knife, and then it can stay in the white tower - or later turned into a different type of a magical weapon when the Aes Sedai go visit that room and notice it.
In hindsight, we don't need the Green Man or a mythical place that appears when you need it most. I can't remember much else being magical like that later in the books. It is fun, and it fits in with the world of the first few books but we really don't need it. That can be written as some town or magical holdout in the Blight, kind of the inverse of Shadar Logoth.
Not sure we need as much about the Whitecloaks as we get.
No need for those waystones or whatever was in the first book. It was never revisited as far as I can remember.
I'd do the ways a waygates a little differently. I don't need two types of traveling, plus the ways, plus the waystones...
The dark ones seals could be more or less built in around his prison rather than these quest items that are all over the place.
I wouldn't have Loial be a main character, or the Ogier be included as much. They can still be in the world, the Steadings can still be a thing, but more like the Circus rather than main characters.
In a way I'd have the story more focused on Rand meeting all these different legends and prophecies about the Dragon Reborn. Him, Mat, and Perrin along with an one or two Aes Sedai can have the adventures that the girls did.
Then lastly on my mind or now, and maybe I glossed over this in the audio books. I get why Caemlyn and Andor are important, but we spend all this time on what seems like a side story. I'd treat them more or less like the other city states, or maybe have them associated with a prophecy that Rand can fulfill (I can't remember if there was one, but it wasn't a spinning sword that's not a sword type thing).
Whatever the crystal jewelry piece that held one of the forsakens souls or whatever it was. That seemed odd when reading it, also seems out of place, and I'd get rid of it or maybe include it earlier and more.
Then I forgot. We have all kinds of different Dark One beasts and creatures, maybe we don't need as many.
RJ was a discovery writer, and seemed to wander off the main plot a lot. That's fine, it has it's moments, and it's entertaining. But, the first few books are different than his middle books, are different than 7-9 and then Sanderson picks things back up as best he can. So the above is to get more contentunity and consistency throughout the series.
[edit] since I forgot there was a TV show... For TV I'd change the above and then limit the main characters and maybe even limit their scope. I wouldn't try to do to much at once, that works in a book, but not on the screen. I'd also maybe just do something like a Northern Exposure that focuses on the Two Rivers area and run with that for a while.