That’s not the whole reason of the Shofar, you know.
Anyhow, being Makriv the ram was materializing the will and determination that he built up to be Makriv his son. Rashi brings a Medrash that by each part of the Korban, Avraham Avinu said, “This should be as if I am doing it to my son.” He didn’t want to feel as if he is getting away with it. He therefore imagined the whole thing as if he was actually doing it to his son.
Chazal tell us that the ashes are placed in front of Hashem, and when we are in trouble He takes a look at it and remembers the Zchus of Klal Yisroel. The Korban of the ram was the tangible object of what Avraham Avinu wanted to do.