For those that wondered about the goals and purposes of ISKCON or any Gaudia Vaisnava movement , their purposes are to teach and serve the interests of Sri Caitanya Mahāprabhu.
In the Caitanya Caratamrita , Sri Caitanya Mahāprabhu has clearly defined all his purposes , each one as important as the other because in Vedic culture the peripherals always connect to the cor .Those who seek to disconnect them or to minimise the importance of any of them or who think the cor goal is not for them do not understand the Sankirtana movement. Sri Caitanya Mahāprabhu has given in His conversion with Ramananda Roy everything we need to know of Mahāprabhu’s intentions.
The reasons are also discussed in the Caitanya Caratamrita.
reasons for Mahāprabhu decent

“The reasons for His descent are categorized into internal (confidential) and external (preaching mission) causes:
Confidential/Internal Reasons
According to the Śrī Caitanya-caritāmṛta, Lord Kṛṣṇa desired to understand Himself from the perspective of His supreme devotee, Śrīmatī Rādhārāṇī:

To Relish Rādhārāṇī’s Love: Kṛṣṇa, as the source of all pleasure, wanted to experience the profound, unalloyed love that Rādhārāṇī feels for Him.
To Taste His Own Sweetness: Kṛṣṇa wanted to know the immense sweetness of His own form that Rādhārāṇī relishes.
To Experience Rādhārāṇī’s Happiness: He desired to feel the transcendental bliss that Rādhārāṇī experiences in her love for Him.
Combined Form: To fulfill these desires, He accepted the golden complexion and sentiments of Śrīmatī Rādhārāṇī, appearing as a combined form of Radha and Krishna , He appeared as Sri Caitanya Mahāprabhu.
The external reasoning is this ..
“To Propagate Yuga-dharma (Sankirtana): The primary mission was to inaugurate the, religion for the age of Kali (yuga-dharma)—the congregational chanting of the Hare Kṛṣṇa mahā-mantra.
To Distribute Premā (Pure Love): He came to give what no other incarnation had ever offered before: the most sublime, unalloyed, and spontaneous love for God (Vraja-prema).
To Teach Through Personal Example: By assuming the role of a devotee, He demonstrated the proper method of approaching and serving the Supreme Lord, showing the humility and dedication required.
To Establish the Supremacy of Mādhurya-rasa: He preached that the highest level of devotion is to follow in the footsteps of the residents of Vṛndāvana (especially the gopīs), moving beyond formal, reverential worship. .

Ww should know the external reasoning for Mahāprabhu’s decent and the practical implementation of it has been formulated by Srila Bhaktivinod Thakur, Srila Bhaktisiddhanta Sarasvati Goswami and has been expertly put in to operation by Srila AC Bhavtivedanta Swami Prabhupada who established it all over the world.

The six Goswami’s of Vrndavana  have the mission originally chalked out .

I offer my respectful obeisances unto the six Gosvāmīs, namely Śrī Rūpa Gosvāmī, Śrī Sanātana Gosvāmī, Śrī Raghunātha Bhaṭṭa Gosvāmī, Śrī Raghunātha dāsa Gosvāmī, Śrī Jīva Gosvāmī, and Śrī Gopāla Bhaṭṭa Gosvāmī, who are always engaged in chanting the holy name of Kṛṣṇa and dancing. They are just like the ocean of love of God, and they are popular both with the gentle and with the ruffians, because they are not envious of anyone. Whatever they do, they are all-pleasing to everyone, and they are fully blessed by Lord Caitanya. Thus they are engaged in missionary activities meant to deliver all the conditioned souls in the material universe.

I offer my respectful obeisances unto the six Gosvāmīs, who are very expert in scrutinizingly studying all the revealed scriptures with the aim of establishing eternal religious principles for the benefit of all human beings. Thus they are honored all over the three worlds and they are worth taking shelter of because they are absorbed in the mood of the gopis and are engaged in the transcendental loving service of Rādhā and Kṛṣṇa.

I offer my respectful obeisances unto the six Gosvāmīs, who are very much enriched in understanding of Lord Caitanya and who are thus expert in narrating His transcendental qualities. They can purify all conditioned souls from the reactions of their sinful activities by pouring upon them transcendental songs about Govinda. As such, they are very expert in increasing the limits of the ocean of transcendental bliss, and they are the saviors of the living entities from the devouring mouth of liberation.

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