I dont why mbj pick that role shyt seem like some throwaway character
Killmonger has potential to be the Venom to BP's Spiderman, or the Deathstroke to his Batman, if that makes sense. Thats essentially what he is/was in the comics, but i mean on the grand stage. In my opinion, biggest thing (outside of a compelling storyline) is to give him a bad ass costume/armor. The whole bare chest thing would be too plain. Modernize the casual look and stylize that one armor he had before, maybe have it look more predator-ish. And, of course, have him superhuman like BP, Cap and Bucky.
I think they also need to do something cool with his trained leopards, even if they go the Falcon route x 1000 and make it a robotic prowler of some sort. That + predator style armor and his super strength and smarts, and he could def be a major presence. Just some ideas