Why is the Bhagavata Mahapurana considered a major Purana? And why was it written?


Even after dividing the Vedas, composing the epic Mahabharata, and composing the eighteen Puranas, the mind of Maharishi Veda Vyas Ji was incomplete.
Then Devrishi Narad Ji told Vyas Ji the reason for that incompleteness was that you had not composed such a book in which the character of Lord Shri Krishna's Leela, qualities, and incarnations are described.
And in Kaliyug, the lifespan of man will be less and the intellect will also be unable to understand the Vedas and other religious texts, and scriptures.
Therefore, for the salvation of the low-intellect humans of Kaliyug, Vyas Ji composed the Shrimad Bhagwat Mahapuran.
And God promised that I will always be present in Bhagwat.
This element has been created from the eternal Brahma. It is the essence of all the Vedas, Puranas, and Upanishads, that is why it is a Mahapuran.
By daily reading of this supreme scripture, there is no untimely death, disease, epidemic, fear of enemies, etc. and man can attain Bhagwat(god) even in Kaliyug and reach the ultimate salvation.
This Shrimad Bhagwat is a very secret and mysterious Purana. It gives the experience of the form of God and is the essence of all the Vedas.
For those who are trapped in the world and want to cross this deep darkness of ignorance, this is a unique lamp illuminating the spiritual elements. Actually, out of compassion for them, Shri Shukdevji, the teacher of great sages, has described it.
Both hearing and singing the glory of Lord Shri Krishna are purifying. He comes and resides in the heart of those who listen to His story and destroy their evil desires; because He is the eternal friend of the saints.
When evil desires are destroyed by the constant reading of Shrimad Bhagwat or the devotees of God, then one attains permanent love for the pure fame of Lord Shri Krishna.
Then the emotions of Rajogun and Tamogun ie lust and greed are calmed down and the mind becomes free from these and becomes pure and situated in Sattvagun(purity).
In this way, when all worldly attachments are erased by loving devotion to God and the heart is filled with joy, then
the essence of God is automatically experienced.
As soon as the self-realized God is realized in the heart, the knot in the heart breaks, and all doubts disappear and the bondage of karma diminishes.
Due to this, intelligent people continuously do love and devotion towards Lord Shri Krishna with great joy, which leads to the attainment of self-satisfaction.