If you can write ancient poetry, modern poetry is even more important.
This kind of thing, one is to look at talent, and the other is indispensable accumulation. We should accumulate from childhood and read more books related to Chinese and characters.
After a certain accumulation, you need to imitate writing. First, imitate writing, write well, and with certain writing experience, you can start writing your own things.
However, the last point is the most important, like and interest. I started writing poems because I like a girl, and now I'm not just writing poems for girls.