Everyone has a different personality, and perhaps Jokic's calm demeanor is what helps him win games because he doesn't panic easily. While the NBA is his profession, he still has a life outside of it. Just imagine if Jokic aims to further improve his game; he would become even more unstoppable. He has a relaxed and laid-back approach, making it seem easy for him to achieve a championship, while others who are overly hyped and desperate for a championship struggle to attain it. In short, Jokic is highly underrated.
I agree that if he starts taking things a lot more seriously, he will probably be able to perform a lot better. But not given enough importance is I think the mental health of a player. The way he talks I don’t think he is in the nearest mental health situation right now. He has to be frustrated.
There is now way that he will be frustrated about what is happening inside the NBA because judging from the way he talks and react about things, he seems like a player that really care and as long as he can deliver a win and gave his best, that will be enough for him. But I agree though, I think there's still a potential from Jokic that needs to be unlock, he just need to be hurt inside the court in-order to unleash his best version.