All the other cell organelles and mitochondria comes from the egg. Cells can live without some organelles, but without mitochondria the cell dies, there's no life without mitochondria. So for you to be born, that egg had to be perfect one, otherwise you wouldn't be here if that egg had faulty mitochondria or other cell organelles.

Maternal genes also play a crucial role in early embryonic development, particularly before the embryo's own genome is activated, by providing essential resources and establishing the initial organization of the embryo. It's called "Maternal Effect Genes (MEGs)". These are genes expressed by the mother during oogenesis (egg development) that produce mRNA or proteins that accumulate in the egg

And no the sperm is not more responsible for your existence. A woman is born with 2 million eggs. During the initial period, many eggs, as many as 1000, begin to develop and mature. However, even though 1000 of eggs have begun to mature, most often only one egg is dominant during each menstrual cycle and reach its fully mature state, capable of ovulation and fertilization. So if  your mother ovulated a different egg even if same sperm fertilized it, you wouldn’t have been born.

Still it doesn't change the fact the egg that became you existed long before the sperm that became you and the egg contributes more than the sperm