Who is a good candidate for going backhome, back to godhead?

If somehow or other one gets the association of pure devotees of the Lord and hears from them the transcendental message of Lord Kṛṣṇa, then one has the chance to become a devotee of the Lord. As mentioned in the previous verse, those who become disgusted with material life take to impersonal philosophical speculation and rigorously try to stamp out any trace of personal existence. Those who are still attached to material sense gratification try to purify themselves by offering the fruits of their ordinary activities to the Supreme. A first-class candidate for pure devotional service, on the other hand, is neither completely disgusted with nor attached to material life. He does not desire to pursue ordinary material existence any further, because it cannot award real happiness. Nevertheless, a candidate for devotional service does not give up all hope for perfecting personal existence. A person who avoids the two extremes of material attachment and impersonal reaction to material attachment and who somehow or other gets the association of pure devotees, faithfully hearing their message, is a good candidate for going back home, back to Godhead, as described here by the Lord.

Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Eleventh Canto, Chapter 20 – Text 08.