What role did An Lushan play in the history of the Tang Dynasty?

I think An Lushan played a role in promoting the demise of the Tang Dynasty in the history of the Tang Dynasty.

An Lushan, whose real name is Kangzhashan, is from Yingzhou. An Lushan's mother is Ashdod, the Great Yan Emperor and the chief culprit of the famous Anshi Rebellion in history. In the early years of Kaiyuan, An Lushan fled from Turkey with an Daomai, son of the general's filial piety and the sons of Ambozhu, An and An Wenzhen, and later became brothers with An and others. From then on, Kangzha Mountain pretended to be a grand master and was named Lushan Mountain. Historically, An Lushan has served as many ambassadors, such as Pinglu, Fanyang, Hedong, Shangshu and Zuo Fu. Later, An Lushan was made king of Dongping County. In 755, he led the Anshi Rebellion. In 756, the State of Yan was founded with the title of Wu Sheng. Later, An Lushan was killed by his own son, and the Anshi Rebellion was put down with his death.

This shows that An Lushan was the initiator of the Anshi Rebellion, so what influence did he have on the Tang Dynasty? Most people who like history know that An Lushan came to the Tang Dynasty with this name after fleeing from the Turks, and the Tang Dynasty was in its heyday. An Lushan was very satisfied with Yang Guifei, so he became Yang Guifei's adopted son, a favorite of Tang Xuanzong, who was also very kind to An Lushan at that time. It was such a person whom Tang Xuanzong trusted and Yang Guifei deeply liked, which started the Anshi Rebellion, accelerated the demise of the Tang Dynasty, and made the later Tang Xuanzong and Yang Guifei part ways. Some people think that the main reason why An Lushan started this war is to protect itself. Although An Lushan had the trust of Emperor Taizong, Yang Guifei's love and great power, he had a bad relationship with other court ministers, who often spoke ill of him in front of Emperor Xuanzong of Tang Dynasty.

Therefore, for the sake of his later life, An Lushan began to take the initiative to master more rights, and therefore thought of being an emperor himself. For the Tang Dynasty, An Lushan belonged to the category of traitors. After all, the Tang Dynasty took him in and gave him aristocratic status and rights, but he in turn promoted the early demise of the Tang Dynasty.