The shofar is intended to awaken and remind
Leviticus Rabbah, 25:5
During the blowing of the shofar, a person will examine his actions, examine his life, and consider how to improve his actions.
The blowing of the shofar sounds when a person is in a large crowd of people, but the observation is intrinsic.
“Blow the horn at the new moon” (Psalms, 81:4)
“In the month – renew your actions,
Shofar – improve your actions”