Saalokya, Saaroopya, Saameepya and Saayujya is generally explained as —-
When a person worships [does upaasana of] a Deity he attains to the world/plane [loka] of that Deity. This is called ‘Saalokya’.
He then attains ‘Saaroopya’ – i.e. he attains the form of that Deity.
Then, he attains ‘Saameepya’ i.e he attains proximity to that Deity.
Finally, he becomes one with that Deity ‘Saayujya’.
Sri Swamiji explains this in a very wonderful way:
When a person does incessant chanting of a Naama in the same place, divinity is created in that place around him. This is verily ‘Saalokya’ [same loka]. That is he attains to that world/loka, here. He then attains the beauty of that Deity or in the case of the worship of a Guru, his gait, talk and everything else becomes just like that of the Guru – ‘Saaroopya’ [same form]. Then, the Deity comes into his heart, which is verily ‘Saameepya’ [proximity] and finally he becomes one with ‘It’ and that is ‘Saayujya.
These are not really external factors as deemed but happen wherever the Nama is chanted incessantly in one place.’
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
To collect people living around one's home and help them chant the Lord's Name is verily service to the Guru. Or to follow the special instruction given to him/her by the Guru is verily 'service' to the Guru.