What does the poem "Recalling Jiangnan" mean?

"Recalling Jiangnan" was written by Bai Juyi, a poet of the Tang Dynasty, who recalled the scenery of Jiangnan in his old age. There are three poems, and this is the first. This poem specifically describes the beauty of spring scenery around the characteristics of Jiangnan, "jianghua" and "jiangshui", and expresses his love and nostalgia for the beautiful scenery of Jiangnan. Introduction to the author: Bai Juyi (772-846): a poet of the Tang Dynasty. A native of Weinan County in present-day Shaanxi Province, he took refuge in the south of the Yangtze River due to war when he was young. He was closer to the working people and understood their painful lives. His poems reflect real life and their language is simple and popular. The main idea of ??the poem: Jiangnan is good! The scenery I know is so beautiful. The rising sun and the flowers and fire on the riverside reflect each other. The river water in spring is as clear as blue grass.

Why isn't it fascinating? How can we make people forget?