After what event did the literature of Tang Dynasty show the spirit of innovation?

It was not until Zhenyuan and Yuanhe years that the intellectuals of the landlord class woke up from being at a loss. They are eager for revival and put forward various reform ideas. Yong Zhen's innovation, Han Yu's anti-Buddhism, Pei Du's rebellion against the West, and Bai Juyi's views on political and economic issues in Ce Lin (seventy-five) are all reflections of this desire for reform. This psychology brought new vitality to the poetry circle in this period. Bai Juyi's advocacy of fable theory in his poems is a direct embodiment of the spirit of literary innovation, while Han Meng's Defamiliarization and Li He's grand pursuit in the poetic world are full of innovative spirit. It is this innovative spirit that prompted the emergence of many poets and poets with distinctive creative personalities and great differences in artistic styles and expression techniques in the poetry circles of the Middle Tang Dynasty. It can be said that the prosperity of poetry (literature) in the middle Tang Dynasty has a lot to do with this spirit of reform.