Pick this leaf.
The pause between "picking" and "this leaf" can better highlight the relationship between action and object.
Cherish/not old spring
A pause between "treasured" and "an ancient spring" makes the sentence more rhythmic and easier to understand.
Poetry/will be evergreen from now on.
The pause between "poetry" and "it will last forever" highlights the leading role of poetry and emphasizes its beautiful characteristics.
Until/forever and ever
The pause between "until" and "forever" makes the sentence more fluent and strengthens the tone of "forever".
Ride the wind and waves/straighten my muddy sail and cross the deep sea
In Li Bai's poems, "Riding the wind and waves sometimes, and set my cloudy sail straight and bridge the deep, deep sea" is the embodiment of great ambition. Try to breathe life into these sentences with your voice, and then pause!