Does the repentance of one who insulted Allah Almighty, intentionally or unintentionally, while angry, then regretted it and pledged to Allah not to return to that act, get accepted?

Blaspheming Allah the Exalted is disbelief, and repeating it indicates contempt. However, the door to repentance is open. No matter how many times a sin is committed, if you repent with sincere repentance that fulfills its conditions, Allah will accept your repentance and erase your sin. The one who repents will not be punished, neither in this world nor in the Hereafter. Therefore, make your repentance sincere, increase your seeking of forgiveness and performing expiating good deeds, strive in supererogatory acts of worship, and hold fast to Allah so that He may keep you firm upon the truth.