UP&DOWN

Many people think of "up and down" as "ups and downs" or "Anxiety" but in American daily conversation, both "up" and "down" have the same meaning of "wanting to" and "doing. In American daily conversation, both "up" and "down" are used in the same positive and active sense of the word "want to" and "will."
the lyrics of the song also contain negative "ups and downs" of the former, but in fact, the latter is more positive and expresses the desire to do even greater things in the future. The latter is actually more of a positive and "I'm going to do even bigger things in the future" feeling.