To refine poetry is to find the unique feeling that expresses the general feeling from the general feeling and the specific feeling that expresses the same feeling from the same feeling, such as Ai Qing's freedom. Choose the right angle to express poetry. Generally speaking, there are two major angles. One is to express one's mind directly, and the poet stands up directly to express his feelings.
As long as you read more, read more, think more, experience more, pay more attention, and have a love for poetry itself, you can at least write your own satisfactory poems and then keep practicing.