Then you scale back a bit and keep making consistent money, just a bit less. The only way things go completely to shit is when you enshittify your product and nobody wants it any more.

Or you could expand to other markets, lots of options that don't require making your products worse.

Markets outside the industrialized world don't have the purchasing power for quality products from the industrialized world. That's why you have to reduce quality to reduce price if you want to sell consumer goods to them. Or wind down your operations. But who would want to wind down their operations?