What was Hitler trying to accomplish in developing an 'Aryan race'?

He was buying into some current but extremely dodgy eugenic theories (America tried a similar experiment).Hitler seems to have become convinced that Germany had lost the Great War because of 'racial weakness' and so searched for an answer amongst ideas of an original blonde-haired, blue-eyed race of heroes (completely phoney it has to be said). This seems to have been the thinking behind plans to rid society of the abnormal, the mentally ill, and members of the so-called 'lesser' races, including Jews, Gypsies and Slavs.

The continued existence in perpetuity of a racially pure Germanic people.

The original Aryans were the noble class of Indic people in Vedic India - it was the word they used to describe themselves,NOT a later construct.There is a plethora of extant evidence for their existence in both primary source literature and from archaeology.

Blonde hair and blue eyes was the ideal for Aryans under the Nazi definition,NOT a prerequisite.

Hitler didn't care about anybody, he had too much hatred inside himself.

He wanted to create one race and put more power in germany so that he could gain more control over the world and show his idea of superiority.

He was from austria and had black hair and black eyes and his grandmother was jewish, go figure.

You answered your own question.

He was trying to accomplish making the world filled with only the Aryan race.

I would like to ask him where he even got the word "Aryan" from, because I never heard of there even being such a race, outside of Hitler trying to make such a race.

Utopia. It just meant killing of 98% of the human race so what he defined as the perfect people could enjoy the earth without having to bother with all those losers. The losers, of course, did not see any merit in his overall plan.

Baywatch without any brunettes!