Infighting.
The people of the country had a very bad weakness, and that was their love for infighting. This was an inherited problem since ancient times. In fact, many countries in ancient times had fallen because of infighting.
Even when their homes were invaded, some people could still shout the slogan that resisting foreign aggression must first settle the internal affairs. They wanted to fight to the death with their brothers before fighting the invaders, but they didn't understand that when you fought until both sides were injured, it would be even easier for the other party to fight you.
This was probably another reason for the decline of Chinese medicine.
The higher-ups were supporting Chinese medicine, but there was still the threat of Western medicine. Instead of working together to promote Chinese medicine, they started fighting among themselves.
If Chinese medicine was supported, Western medicine would just look at it.