What does it mean to ask who owns the ups and downs of calligraphy works in such a vast land?

Who will decide the rise and fall of this vast land? This sentence is Shang que's last sentence, which directly turns from scenery writing to lyricism, and naturally brings out the lyrical movement in the second half. This poem comes from the last sentence of Mao Zedong's "Qinyuanchun Changsha", and some of the original words are as follows: Independent cold autumn, Xiangjiang River going north, Orange Island. Look at the mountains and plains, and the forests are all dyed. The river is full of water, and hundreds of people compete for the flow. The eagle strikes the sky, the fish is shallow, and all kinds of frost fight for freedom. Lonely, ask the boundless earth, who is in charge of ups and downs.