Rosh Hashanah is about the largest of themes. It's about creation. Hayom haras olam.
Today is the birthday of the world.
It's about judgement. G-d is enthroned in majesty, passing judgement on all that is. And it's about Teshuvah, penitence, or better still, return. But when we turn to the readings for these days, they are about none of these things. The Haftarah for the first day is about Hannah and her prayer for a child.