A devotee should not only chant the holy name, but should preach the chanting of the holy name to others:

(Isvara Puri to Lord Caitanya): "My dear child, continue dancing, chanting and performing saěkértana in association with devotees. Furthermore, go out and preach the value of chanting krsna-näma, for by this process You will be able to deliver all fallen souls."
It is another ambition of the spiritual master to see his disciples not only chant, dance and follow the regulative principles but also preach the saěkértana movement to others in order to deliver them, for the Kĺńëa consciousness movement is based on the principle that one should become as perfect as possible in devotional service oneself and also preach the cult for others' benefit. There are two classes of unalloyed devotees—namely, gosthy-änandis and bhajanänandis. Bhajanänandi refers to one who is satisfied to cultivate devotional service for himself, and gosthy-änandi is one who is not satisfied simply to become perfect himself but wants to see others also take advantage of the holy name of the Lord and advance in spiritual life. The outstanding example is Prahläda Mahäräja. When he was offered a benediction by Lord Nrsimhadeva, Prahläda Mahäräja said:
"My dear Lord, I have no problems and want no benediction from You because I am quite satisfied to chant Your holy name. This is sufficient for me because whenever I chant I immediately merge in an ocean of transcendental bliss. I only lament to see others bereft of Your love. They are rotting in material activities for transient material pleasure and spoiling their lives toiling all day and night simply for sense gratification, with no attachment for love of Godhead. I am simply lamenting for them and devising various plans to deliver them from the clutches of mäyä." (SB  7.9.43)
Srila Bhaktisiddhänta Sarasvati Takkura explains in his Anubhäsya, "A person who has attracted the attention of the spiritual master by his sincere service likes to dance and chant with similarly developed Krsna conscious devotees. The spiritual master authorizes such a devotee to deliver fallen souls in all parts of the world. Those who are not advanced prefer to chant the Hare Kĺńëa mantra in a solitary place." Such activities constitute, in the language of Srila Bhaktisiddhänta Sarasvati Thäkura, a type of cheating process in the sense that they imitate the activities of exalted personalities like Haridäsa Thäkura. One should not attempt to imitate such exalted devotees. Rather, everyone should endeavor to preach the cult of Sri Caitanya Mahäprabhu in all parts of the world and thus become successful in spiritual life. One who is not very expert in preaching may chant in a secluded place, avoiding bad association, but for one who is actually advanced, preaching and meeting people who are not engaged in devotional service are not disadvantages. A devotee gives the nondevotees his association but is not affected by their misbehavior. Thus by the activities of a pure devotee even those who are bereft of love of Godhead get a chance to become devotees of the Lord one day.
Sri Caitanya-caritämrta Ädi-lilä 7.92

One who is advanced in chanting the holy name induces others to chant:
Many fools, not knowing the transcendental nature of the Hare Krsna mahä-mantra, sometimes impede our loudly chanting this mantra, yet one who is actually advanced in the fulfillment of chanting the Hare Krishna mahä-mantra induces others to chant also. Krsna däsa Kaviräja Goswami explains, krsna-sakti vinä nahe tära pravartana: unless one receives special power of attorney from the Supreme Personality of Godhead, he cannot preach the glories of the Hare Krsna mahä-mantra. As devotees propagate the Hare Krsna mahä-mantra, the general population of the entire world gets the opportunity to understand the glories of the holy name.
Sri Caitanya-caritämrta Ädi-lilä 7.83

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