If tariffs are held strong, there will be two possible outcomes:
1) Domestic production will be increased (via American businesses as well as onshoring foreign businesses), providing jobs and ultimately lower-cost products
2) International tariffs will be decreased across the board - resulting in a more level field for American businesses to compete in foreign nations
Few realize American goods have been tariffed internationally for decades, resulting in a difficult-or-impossible business climate for American businesses.
The situation is akin to Wall Street's infamous short-term outcome favorability. Tariffs are a long-term game, and people have to be willing to trade some short-term outcomes for the long-term economic health of America and it's businesses (and jobs, wages, etc).