What is the writer of "Do Not Go Gentle Into That Goodnight" asking his father to do?

In the poem "Do Not Go Gentle Into That Good Night," Dylan Thomas is imploring his father to resist death and to fight against the inevitability of dying. The poem reflects Thomas's anguish over his father's declining health and serves as an emotional plea for him to "rage against the dying of the light." The repeated refrain emphasizes the struggle against death and the desire for life and vitality, urging his father to persist and demonstrate strength in the face of mortality.