There is a really simple formula to being a successful nation financially, as old as time itself.
You have to take something, lets say a lump of coal and a lump of hematite, and from that make something else, lets say a shovel - by doing that you add value to that raw ingredient. or you can just grow or extract that raw ingredient and sell it in bulk to a third party
Then you must sell that good to someone else, outside of your financial system, hence bringing wealth into your system.
Around that you have to set up support structures, sales, insurance, pensions, banking, HR, Law to serve the primary function, but they must never cost so much as to erode the principal margin.
That way a successful economy grows, its how we, and many western nations became rich - however, we lost sight of the core business, thought of it as grubby and gave it away thinking the service structures would be enough - no surprise the countries that took over the "making" element are on the ascendent and we are in decline.
Slowly the "service" elements will follow, they are relatively easy to move around, or with modern technology, to remove and reduce.
Hence, yes, terminal decline. I own a small manufacturing business, life is still good, but in my 25 years in the business I have seen almost all my competitors and allies vanish - I'm fortunate to have recruited a keen as mustard 18 year old to train as a machinist, and he shows great promise and will never be out of work, but its so bloody rare now.