My dear , in the teachings of Lord Caitanya Srila Prabhupada gives a very interesting explanation of why we exist. Here it is:
"The Supreme Absolute Truth, the Personality of Godhead, is compared to a blazing fire, and the innumerable living entities are compared to sparks emanating from that fire. Although both the Supreme Lord and the living entities are qualitatively fire, there is yet a distinction. Viṣṇu the Supreme is infinite, whereas the living entities, which are but sparks, are infinitesimal. The infinitesimal living entities are emanations from the original infinite spirit.
In their constitutional position as infinitesimal spirits, there is no trace of matter.
"The living entities are not as great as Nārāyaṇa, Viṣṇu, who is beyond this material creation. Even Śaṅkarācārya accepts Nārāyaṇa to be beyond the material creation. Since neither Viṣṇu nor the living entity are of the material creation, someone may inquire, 'Why were the small particles of spirit created at all?' The answer is that the Supreme Absolute Truth is complete in His perfection when He is both infinite and infinitesimal. If He is simply infinite
and is not infinitesimal, He is not perfect. The infinite portion is the Viṣṇu-tattva, or the Supreme Personality of Godhead, and the infinitesimal portion is the living entity.order to become qualified to go back to home, back to Godhead we need to take initiation from the bona fide spiritual master and be obedient to him, accepting his orders as our very life and soul. If we do not come to this standard we remain caught up in the cycle of birth and death suffering like anything in the
threefold miseries and the fourfold miseries."
In short, our existence is the perfection of Krishna's existence.
Sankarshan Das Adhikari