Why Allah said himself as "he" instead of "I"?

Bismillah, Peace be upon you all. In below verses of Holy Qur'an why does Allah uses "he" instead of "I" when referring to things Allah has done.e.g he has subjected and he makes the sign clear. 2. It is Allah Who has raised the heavens without ٖدَمَع ِۡيَغِبِتَٰوَٰمَّسلٱَعَفَر يَِّلٱَُّللٱ pillars—as you can see—then established Himَرَّخَسَو ِۖشۡرَعۡلٱ ََع ٰىَوَتۡسٱ َّمُث ۖاَهَنۡوَرَتself on the Throne. He has subjected the sun and ٖلَجَِل يِرَۡي ُّٞك َۖرَمَقۡلٱَو َسۡمَّشلٱthe moon, each orbiting for an appointed term. He conducts the whole affair. He makes the signs ِتَٰيلۡأٓٱُلِّصَفُيَرۡمَۡلٱُرِّبَدُي ّۚٗمَسُّم clear so that you may be certain of the meeting َوُهَو ٢َنوُنِقوُت ۡمُكِّبَر ِءٓاَقِلِب مُكَّلَعَل with your Lord. 3.And He is the One Who spread َِسَٰوَر اَهيِفَلَعَجَوَضرَۡۡلٱَّدَم يَِّلٱout the earth and placed firm mountains and riversاَهيِف َلَعَجِتَٰرَمَّلثٱُِّك نِمَوۖاٗرَٰهۡنَأَوupon it, and created fruits of every kind in pairs.