Ya know more emphasis on the comedy, showcase Naruto's good well nature with everyone - > yes Sasuke & Hinata included... Definitely a huge lack of overused flashback.
Think like this... Naruto wants to become Hokage
let's explore what steps he has to take as a shinobi to become hokage, and no kittening detours.... Yeah "Saving Sasuke" for post- timeskip plotline looking at you lol
It could be a goal, but not the primary goal of Part 2.
Expand more upon the world building of the ninja world.
the history of Shinobi could be like an ancient myth that once existed, but no one's been able to prove of its existence.
Let's take Gol D. Roger for example... he started an era on the day of his execution.
So in conjunction with that lets say use Tailed beasts for example.... say that their regarded as myths throughout the world, and only a rare select individuals know of their existence.
They wouldn't be exclusive to just near by villages.... in my opinion I feel that severely diminished the scope of the world of Naruto.
I think you could have it to where they can throughout each continent of the world, and they can be in locations that even anbu black ops would have a hard time knowing they actually existed.
Essentially make them like mythological creatures no one has ever seen for centuries and centuries before Naruto's era.
Much like how Gol D. Roger ushered an into an new age of pirates in One Piece.....
The night The Nine Tails attacked the Leaf Village in that sense could kickstart a new era of Shinobi in search of these Mythological creatures.
I'll take it a step further,.... The 5 great nations... we visit Sand village for example, but instead of just getting a brief overview... we actually see how people live their lifestyle, their culture, and how they differ from The Leaf Village.
You could do the same thing with the Stone, Cloud, and Mist Village too.
You explore how distinct the shinobi are in each village.
Something along those lines.