"Still lie the sheltering snows, undimmed and white;
And reigns the winter's pregnant silence still;
No sign of spring, save that the catkins fill,
And willow stems grow daily red and bright.
These are days when ancients held a rite
Of expiation for the old year's ill,
And prayer to purify the new year's will."
Helen Hunt Jackson, A Calendar of Sonnet's: February
Pay attention to how native English speakers are phrasing things.
Pay attention to what words and phrases are used in, for example, a news article or some novels that you're reading.
Pick up some words and phrases that you didn't know, use them in sentences and learn how to use them yourself.
Practice daily. Knowing a thing and actually using the knowledge is a different thing.
You need to practice in order to become able to use it.
Pay attention to how native English speakers phrase things.