Earned Light and Gifted Light
The great light of the first night of Pesach arrives without our effort and so does not last; counting the Omer brings it in day by day through our own deeds.
The Bnei Yissaschar asks why the Torah calls the day before the counting by the word Shabbos: from the morrow after the Shabbos you shall count. He explains that on the first night of Pesach, every year, great lights descend from Above in the heights, as a miracle and not through our deeds. Because they come without our work, they have no lasting hold. So Hashem commanded us to count, day after day, and the lights enter slowly through what we do, until all are complete on the day the Torah was given, Shavuos. This is the sense of the words to count for yourselves: it is for your benefit, so that the gift will endure. The Torah calls that first day Shabbos because, like Shabbos, its light comes of itself. He adds the Midrash that the weeks are complete when Israel does His will, for then the light comes through our own acts and has a foundation.
Source: Bnei Yissaschar, Maamarei Chodesh Nissan, Maamar 12:3-4
Think of a time when you were suddenly inspired, perhaps at a Seder, at a funeral or at the Kosel, and then the feeling faded. That fading is not a failure. Choose a small step that can make the memory real, such as five minutes of learning at a fixed time each day, and count the days you keep it. Like the Omer, a little each day turns a gift you did not earn into something that becomes your own.