Tariffs to produce market effects (like onshoring) only work if those tariffs are observed to be durable (in four years all these tariffs will evaporate) and are strengthened by being paired with other encouragement (i.e. industry development subsidies).

These tariffs are arbitrary and capricious and no business would rationally respond to them with any kind of long term investment. People just want to weather the storm of the mad king and international partners are developing alternative relationships to seek more stability.