Honestly, I have no idea. Nobel prize winning economists can't agree. What chance do us mere mortals have!
It could be anything from gaining some relatively minor trade concessions, to a complete change in the global trading system, like when Nixon ended the gold standard in 1971. Trump's chief economic adviser, Marin, is saying that countries need to compensate the USA for the decades they have spent back-stopping the global trading system. The USA is drowning in debt, and it seems Marin wants countries who hold US debt to extend the repayment or even write some of it off.