There is an embedded assumption in the question that he does profit in some way from it, but based on his past behavior it’s a pretty safe guess.
Most of the reporting I have seen on this talks about the impact of the different tariffs, but not the “why” behind it (beyond parroting what Trump says, which is never true). I’m particularly interested in the tariffs on Canadian goods and energy. The justification about stopping fentanyl smuggling is an obvious lie. (It isn’t a real problem, and tariffs have nothing to do with drug smuggling. All but the mentally handicapped can figure that out for themselves.)
It could also be the US recognizing that it needs to decrease its sphere of influence in order to strengthen it. Perhaps focusing its imperialism on the Americas as global hegemony becomes unsustainable. These are the only conclusions I can come to without giving in to conspiracy.