The Han Chinese controlled the Great Wall and blocked trade and intelligence from the steppe peoples. That caused the steppe peoples of East Asia to lack salt, tea (to supplement vitamin C and avoid sepsis), metalwork, and almost all other necessities of life. Also, the Han Chinese often used the Great Wall to cover up army movements and frequently attacked the unsuspecting steppe peoples. This led to the extremely poor living conditions of the steppe peoples. 1949 China's first census, the life expectancy of the nomadic herders on the Mongolian steppe at that time was only 19.8 years old. It can be seen that the life expectancy of nomads in ancient times was only shorter.
It was difficult enough to keep the tribe alive in such a harsh environment. Apart from the Hun royal family, it was impossible for other Hun nomads to maintain the integrity and purity of their bloodline.
In general, the royal court of the Huns was in the Loop region of China. In the third century B.C., the first complete and unified Han empire (the Qin dynasty) was about to emerge and made no secret of its hostility to the steppes. And at that time almost all of the East Asian steppe tribes chose to join the king of the Xiongnu in order to cope with the Han people that was about to enter the age of empire. This is the original story of the Han people and his thousand year old mortal enemy.
Whereas the royal Ashina family of the Turkic people came from the Outer Mongolian steppe, the Turkic tribes were a collection of nomadic people from the Altai Mountains. So it was a Central and North Asian nation, not an East Asian nation.