Pṛthu Mahārāja desired to serve the Lord with the goddess of fortune, but this desire does not mean that he was situated on the platform of mādhurya-rasa. The goddess of fortune is engaged in the service of the Lord in the rasa of mādhurya, conjugal love. Although her position is on the chest of the Lord, the goddess of fortune, in her position as a devotee, takes pleasure in serving the lotus feet of the Lord. Pṛthu Mahārāja was thinking only of the lotus feet of the Lord because he is on the platform of dāsya-rasa, or servitorship of the Lord. From the next verse we learn that Pṛthu Mahārāja was thinking of the goddess of fortune as the universal mother, jagan-mātā. Consequently there was no question of his competing with her on the platform of mādhurya-rasa. Nonetheless he feared that she might take offense at his engaging in the service of the Lord. This suggests that in the absolute world there is sometimes competition between servitors in the service of the Lord, but such competition is without malice. In the Vaikuṇṭha worlds if a devotee excels in the service of the Lord, others do not become envious of his excellent service but rather aspire to come to the platform of that service.
(Srimad Bhagavatam------4:20:27------purport).

Kṛṣṇa, the Supreme Personality of Godhead as the son of mother Yaśodā, is very easily available to devotees, but not to tapasvīs, yogīs, jñānīs and others who have a bodily concept of life. Although they may sometimes be called śānta-bhaktas, real bhakti begins with dāsya-rasa. Kṛṣṇa says in Bhagavad-gītā (4.11):
ye yathā māṁ prapadyante
tāṁs tathaiva bhajāmy aham
mama vartmānuvartante
manuṣyāḥ pārtha sarvaśaḥ
"As living entities surrender unto Me, I reward them accordingly. Everyone follows My path in all respects, O son of Pṛthā." Everyone is seeking Kṛṣṇa, for He is the Supersoul of all individual souls.
(Srimad Bhagavatam------10:9:21------purport).

If a devotee wants simple liberation, he gets it very easily from the Supreme Personality of Godhead, as confirmed by Bilvamaṅgala Ṭhākura. Muktiḥ svayaṁ mukulitāñjali sevate ’smān: for a devotee, mukti is not very important because mukti is always standing on his doorstep waiting to serve him in some way. A devotee, therefore, must be attracted by the behavior of the inhabitants of Vṛndāvana, who live in a relationship with Kṛṣṇa. The land, water, cows, trees and flowers serve Kṛṣṇa in śānta-rasa, His servants serve Him in dāsya-rasa, and His cowherd friends serve Him in sakhya-rasa. Similarly, the elder gopīs and gopas serve Kṛṣṇa as father and mother, uncle and other relatives, and the young gopīs, the cowherd girls, serve Kṛṣṇa in conjugal love.
(Sri Caitanya Caritamrta------1:8:19------purport).

There are also other planets in the spiritual world, called Vaikuṇṭha planets, and on these planets Lord Nārāyaṇa is worshiped with awe and veneration. On these planets śānta-rasa is prevalent, and some of the devotees are also connected with the Supreme Personality of Godhead in dāsya-rasa, the mellow of servitorship. As far as the mellow of fraternity is concerned, in Vaikuṇṭha this rasa is represented by gaurava-sakhya, friendship in awe and veneration. The other fraternity rasa, exhibited as viśrambha (friendship in equality), is found in the Goloka Vṛndāvana planet.
(Sri Caitanya Caritamrta------2:19:154------purport).

Dāsya-rasa, or dāsya-bhakti-rasa, is described in the Bhakti-rasāmṛta-sindhu (3.2.3–4) as follows:
ātmocitair vibhāvādyaiḥ prītir āsvādanīyatām
nītā cetasi bhaktānāṁ prīti-bhakti-raso mataḥ
anugrāhy asya dāsatvāl lālyatvād apy ayaṁ dvidhā
bhidyate sambhrama-prīto gaurava-prīta ity api
When according to his desires the living entity develops love for the Supreme Personality of Godhead, this beginning stage of love is called dāsya-bhakti-rasa. Dāsya-bhakti-rasa is divided into two categories, called sambhrama-dāsya and gaurava-dāsya. In sambhrama-dāsya, the devotee renders respectful service to the Supreme Personality of Godhead, but in the more advanced gaurava-dāsya, his service takes the form of giving protection to the Lord.
(Sri Caitanya Caritamrta------2:19:185------purport).

However, when this knowledge is further developed, one is convinced that the Paramātmā, the Supreme Lord, is the master and that the living entity is His eternal servant. One then attains the platform of dāsya-rasa. In dāsya-rasa the Lord is accepted with awe and veneration. Thus the active service that is absent in śānta-rasa becomes prominent in dāsya-rasa. In other words, in dāsya-rasa the qualities of śānta-rasa are present, and service also becomes predominantly visible. Similarly, when this same rasa is developed into fraternity (sakhya-rasa), a friendly intimacy is added. There is no awe or veneration in sakhya-rasa. Therefore sakhya-rasa is invested with the qualities of three rasas—śānta, dāsya and sakhya. Similarly, on the platform of parental love, the qualities of śānta-rasa, dāsya-rasa and sakhya-rasa are fully developed in another form—the sense of maintaining the Lord. Therefore on the platform of parental love there exists a combination of the qualities of four transcendental mellows—śānta, dāsya, sakhya and parenthood.
(Sri Caitanya Caritamrta------2:19:228------purport).

Bahūnāṁ janmanām ante jñānavān māṁ prapadyate (B.G.7:19): "After many, many births of worshiping Brahman and Paramātmā, when one surrenders unto Vāsudeva as the supreme master and accepts himself as the eternal servitor of Vāsudeva, he becomes a great transcendentally realized soul." At that time, due to his thick and thin relationship with the Supreme Absolute Truth, one begins to render some sort of transcendental loving service to the Supreme Personality of Godhead. Thus the neutral relationship known as śānta-rasa is transformed into dāsya-rasa, servitorship.
(Teachings of Lord Caitanya).

On the platform of dāsya-rasa, the greatest quantity of awe and veneration of the Supreme Lord is exhibited. That is, in the dāsya-rasa, the greatness of the Supreme Lord is appreciated. It should be noted here that on the platform of śānta-rasa there is no spiritual activity, but on the platform of dāsya-rasa, service begins. Thus in the dāsya-rasa the quality of the śānta-rasa is exhibited, and, in addition, there is consciousness of the transcendental taste of service. Transcendental qualities are certainly present in the śānta-rasa and dāsya-rasa, but beyond these there is another quality, confidential attachment, which is pure transcendental love. This loving confidence in the Supreme Personality is technically known as viśrambha.
(Teachings of Lord Caitanya).