I'd change NOA's brand approach from over-emphasizing a kid friendly/childish image and try to paint Nintendo as a brand for everyone; kids, teens, adults and families by emphasizing gameplay and fun rather than trying to appeal specifically to younger age demographics by talking down to the audience.
I'd take the NST branch from out of the doghouse and try to rehabilitate it into an actual studio making actual games again instead of its current image as the 'Mario vs. Donkey Kong' studio.
I'd sign Platinum into an exclusive 2nd party contract and have them work on new IPs, 2nd tier Nintendo franchises and other franchises that have been long dormant.
I'd continue rehabilitating Nintendo's relationships with Japanese 3rd parties and salvage what I can with western 3rd parties without having them walk all over Nintendo
Lastly, I'd try to buy Capcom and rebrand it as the company's development branch that emphasized titles for teens and adults (kind of like what DC Comics does with its Vertigo imprint). If that can't happen, I'd start a new large development branch within Nintendo that served that same purpose.
