Can expiation be made for the sin of blaspheming the Divine Self, which I uttered in a moment of anger, knowing that I repented and sought forgiveness immediately?

Cursing Allah the Almighty is an act of disbelief that expels one from the fold of Islam. However, if one repents with sincere repentance, their repentance will be accepted, based on the words of Allah the Almighty: "Say, 'O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah. Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.'" Whoever curses Allah must utter the two testimonies of faith (Shahadatayn) and perform ghusl (ritual bath).