Wakanda: Take it back to the essence, which was a treatment on an advanced, and unsullied African society. A society that’s development accelerated not only because of Vibranium, but also because its culture evolved along an unbroken chain. Their government, and politics would have also evolved uninterrupted, and therefore the written conflicts need to be creative, unique, and probably unfamiliar to our modern political tropes.
T’Challa: The stoic no-nonsense leader that knows he’s the baddest mofo in the room not because he’s entitled but because he was trained to be so. Like a Wuxia hero he’s unlikely to be bested by a lesser foe. Even when beaten by a superior enemy, he learns from this, never to lose in the same way twice.
Also: Add more family members.
Choose an Art Director, and have artist stay on-model for at least the lead characters.
Keep the main book the main book, put the cross-overs on the side.
These are some of the things that would bring me back.