How can man reach the highest rank in the Sight of Allah?
In the Name of Allah, The Most Gracious, The Most Merciful. Praise be to Allah, the Lord (The One and Only) of the Worlds, and blessings and peace be upon our Master Muhammad, the Truthful and the Faithful.
The worldly life is limited, and no matter how rich you might be, you eat what suffices you, you drive one car and you put on one set of clothes, right? On the other hand, righteous deeds are limitless, and due to your good deeds you may reach the highest rank man can ever imagine, because your rank in the Sight of Allah is based on the good deed you perform, and here is the proof from the Noble Quran:
(And for all, there will be degrees according to that which they did)
The purpose of your existence is to offer good deeds:
("My Lord! Send me back* "So that I may do good)