Okay we'll take RAW first.
The first thing I would do is to shake up the main event scene. Don't know about anyone else but I'm tired of seeing the Shield guys fighting for every title except the Tag team title. If you are going to put Rollins in a feud with HHH, then get HHH and his arse out there to at least promote it. This is turning into the Undertaker/Wyatt match at Mania a couple of years ago. Wyatt carried that on his own, Taker was represented by a bolt of lightening. HHH is nowhere to be seen. Why Rusev isn't involved in this group I have no idea. He is a legit contender for the WWE title not wasting his time with Enzo and Cass. Also take Lana out of it and put her in the women's division.
Put Reigns in concrete feud for the US Title. Right now he is doing nothing with it, except carrying it around. Why he's feuding with Owens I have no idea, defend your own title first. Sami Zayn or Braun Strowman should be going after him. Let that bunch mix it up for awhile.
Take Enzo out of the equation and put him in the cruiserweight division. Cass is better off as a singles wrestler and if done right can have a legitimate run. As long as they don't screw it up again. He is more over than most at this point in time.
When Balor returns, I hope to see him reform the Bullet Club and take over RAW. But we'll have to see how and when that will work. Seems that everything is up in the air until his return.
As for Smackdown.
James Ellesworth has run his course and needs to go take a backseat now. Give him is title shot, have Styles beat the living daylights out of him and then send him to the lower midcard or the CW's.
Ambrose and Miz would make a good feud for the IC title, but leave it on Miz. Like another poster said, he has done more the for the title than anyone else has. The way Miz treats the IC title compared to the way Reigns treats the US title is like night and day. Miz actually cares that he has it like the way Cena treated the US title. They both made them a big deal, not just something to throw over your shoulder as your walking down the ramp.
Hoping that Samoa Joe gets called up soon and goes to SD. I would love to see him in a feud with Styles, barring that put Bray or Orton into the main event scene. Orton isn't getting any younger and with his shoulder one more injury could do him in. I would like to see him hold the title one more time before he hangs up his boots.
The tag division will work itself out but they have to start booking America Alpha just a little better. These guys are incredibly over and again look like they can go with anyone on the roster. The Uso heel turn has done them a world of good, so you have three teams AA, Uso's and Wyatt's sitting on the top of the heap. Any of the three would be championship material.
Alexa Bliss is holding her own, and with Mickie James rumoured to be on the way, this should be good. Again you have 4-6 women that can at anytime hold the title and be believed. So not worried about them at all.
As we head into this Mania season, SD seems to be doing better overall with their booking and their storylines. Hopefully that will continue to be the case going forward. RAW has a lot of shit to sort out, put the right people into the right feuds, and they will be okay as well.