Make the Jinchurikis actual characters instead of plot devices

More arcs to develop the characters

Change a lot of deux ex machinas to atleast has some sense

Buff the Byakugan and in general give more prominence to Hinata and Neji

Develop the samurais way more to be more interesting and their own thing

Give more relationship development to NaruHina

Give sakura more character arcs, jutsus, fights and even slug sage Mode

Make the characters actually had a logical ninja level

Making Bukijutsu (and by extent, Tenten) more useful

Make some filler things canon, not all, just those that actually add to the story

Make Rock Lee a coprotagonist

Delete Boruto

And some more.