Why did Allah (swt) send Humans to this planet?

Ayat 35 - 38

In ayat 30, Allah (swt) says he will send us (people) to Earth as His successive authority. To which everybody disagrees. Satan and Angels alike. Yet Allah (swt) did not change His plan of sending Adam (as) to Earth. These ayats, numbered 35 to 38 are a part of His this plan. Allah (swt) here sends Adam and his wife to paradise. Forbids them from eating from a certain tree. Satan dilludes them and they end up disobeying Allah (swt) and tastes the fruit of forbidden tree. Allah (swt) therefore sends Adam (as) and his wife to earth. He also places Satan on Earth. He makes satan and the Mankind enemy of each other. Followers of Satan will see destruction in this life and life hereafter. Followers of Allah (swt) will see success and colors in this life and the world after.

Dua

Adam (as) on repentance prayed to Allah (swt) for forgiveness. Surah Araf Ayat 23.