Parashat Ha'Azinu: NO OTHER GOD

Parashat Ha'Azinu is the song HaShem commanded Moshe Rabbeinu to write as a witness for all time. In this week's Torah portion, HaShem says He is the only God, and the consequences for ignoring this fact are quite severe. Judgment Day on Rosh HaShana is in a couple days and Yom Kippur is next week, how did we use our time over the past month?