Every country needs its own manufacturing base to protect its sovereignty and to sustain a working class mainstay for the economy.
Tear up those free-trade accords and leave the WTO. Impose a blanket 20% customs/countervailing duty on all imports. Negotiate individual customs duty arrangements with countries willing to trade with the United States on an equitable basis.
Asking American companies to find an alternative to China is no different than asking them to move to Mexico under NAFTA. America will not be great again unless it returns to manufacturing.