And also I agree with you, he took a risk too when he went to Miami, because maybe there were expectations pinned on him that if those expectations couldn't be met then it would turn someone who values him into hate. As happened to him before at Paris Saint Germain.
I wouldn't think he is taking any more risks than he did before in his career. He himself said that it is finally the time to relay and play soccer without pressure. I think that says a lot about the risk and pressure he is going to face. It won't be big. He will still play excellently and the crowd will enjoy him. I can understand how he is looking forward to this.
My guess is that he has deep business involvement in the US considering that Apple and Adidas are also involved in the deal between him and Inter Miami. He wants more time to be dedicated to his family and business besides playing soccer. The national team would be traveling around the globe and he said he wants to take a break for 2023? Or for a fully year? I am not sure about that but in about a year there is the Copa America and if he is in shape I doubt that whoever is the coach would not ask him to come and play. However, if Messi likes his new life and doesn't want any more pressure than necessary, it is also possible that he will say goodbye then to the national team.
Precisely this is a great step for a player to do something that will make money when he retires from football. and it seems that all the players do this too, yes they start pioneering careers in business to prepare everything they need in old age. And with the great name he has of course it helps him in developing and realizing it.