In the face of a declining industry, where should practitioners go?

There are roughly three kinds of "declining industries". First, it has been eliminated by society and must be resolutely abandoned; The second is that it has not kept pace with the times. If some foods are greasy, sweet and unhealthy, it is necessary to improve and upgrade. The third is ancient trade, special craft and so on. In the past, these handicrafts were for the public to see, but now mechanized production is beautiful and cheap, and there are fewer customers. It should be transformed into practical works of art for high-end customers.