Poetry has realism and romanticism.
The Book of Songs initiated realism.
Chu Ci initiated romanticism.
Most of the poems at that time were long and short sentences, and some of them didn't rhyme.
Later, Yuefu poetry (realism) appeared.
During the Three Kingdoms period, Jian 'an had seven sons and three practices, mostly four words without words.
Tao Yuanming was a great poet who appeared in Wei, Jin, Southern and Northern Dynasties.
Poetry began to mature in the Tang dynasty, with quatrains and metrical poems, but poems are not necessarily exactly the same number of words. For example, Li Bai's Dream of Ascending to Mount Tianmu.
In the Song Dynasty, poetry did not go down the historical stage, but continued to develop in the form of long and short sentences (words). Because long and short sentences are more catchy and conform to people's habits. Later, China's traditional operas began to enter the historical stage (Yuanqu).
After the May 4th Movement, people began to write vernacular Chinese, which is the way we speak. So a new poem appeared.
New poetry is different from ancient poetry, which pays more attention to the inner essence of poetry.
But now many poets are nothing but rubbish.
Even if it is published in the newspaper, it doesn't mean that what he wrote is good.
If you really want to develop in poetry, read more ancient poems.