Why does the Creator refer to Himself in the plural form although He is the One and Only God?

When the Lord of the worlds uses the word "We" to refer to Himself in many of the Qur’anic verses, this indicates that He alone combines all the attributes of beauty and majesty. In the Arabic language, this also indicates power and greatness. Moreover, in the English language it is called the "royal we" where the plural pronoun is used to refer to someone who holds a high office like the king, the monarch, or the sultan. However, the Qur’an always stresses the fact that Allah is One when it comes to worship.