What is the relationship between Sino-Tibetan language family and Yenisei language family of ancient Siberian language family? Did Han ancestors enter China from Siberia to the Mongolian Plateau?

The Han nationality is a mixture of many nationalities. I think that the distant ancestors of the Han nationality in the southwest may have entered Yunnan from the southern foothills of the Himalayas, and the ancestors of the Han nationality in the Central Plains may have come from Central Asia and the Mongolian Plateau. Now even many yellow people in Southeast Asia think that their distant ancestors came from the distant northern cold areas. I think these two migration roads coexist. The South Road is closely related to the early Yunnan-Guizhou and Lingnan people, and the North Road is closely related to the early northerners and the Central Plains people. The places where the two roads pass overlap with the settlement areas, and eventually they merge into the Han nationality.