As someone with a career in manufacturing who lived in the rust belt most of my life: I knew I was fucked financially each time Trump won, even without the needing to move to avoid hostile laws. What American manufacturing needs is affordable housing, reasonable trade, subsidies to start, and to accept that thr future of american manufacturing is high tech manufacturing that relies on our high numbers of engineers and our skilled tradespeople. Well paid, unskilled manufacturing jobs aren't coming back, but sensible forward thinking policies can ensure we have plenty of jobs designing, building, operating, and maintaining advanced and modern manufacturing systems.
Also the fact that our currency is highly valued isnt the best strategy for manufacturing, but it's an excellent strategy for other industries like finance and provides us a powerful ability to purchase foreign goods.