Self-sufficient, not dependent on any country. The idea is great and I believe every country thinks of it, but is it easy to implement? I don't think so.
To be self-sufficient requires many factors, that country must have enough resources such as labor, raw materials, energy and especially technology. But look at all the countries in the world, how many countries can fully converge those factors except China and the US? It is not by chance that these two countries are the world's leading powers, everything has its reasons.
Not to mention, to be able to produce cheap goods like China is even more complicated, and so far only China has been able to do that.
Easier said than done, not as simple as we think.
China, USA along with few big powers have the capability to produce every single item that is used by humans and that’s certainly not every country in the world can do. There are some things which are vital for every country survival like pharma products, food items and so on.
Apart from that countries that rely heavily on textile, fruits and vegetable exports must also develop expertise to produce products related to engineering and technology. The benefit of exporting engineering and technology related product is that you earn huge revenue with little effort. It’s only difficult to establish manufacturing units along with training of manpower, once it’s done the rest of cycle continuous with minimum effort