Both mother (Queen Suniti) and son (Dhruva Maharaja) decided to take shelter of the lotus feet of the Lord because that is the only solution to all material problems
SB Canto 4
The great sage Maitreya continued: The instruction of Dhruva Mahārāja's mother, Sunīti, was actually meant for fulfilling his desired objective. Therefore, after deliberate consideration and with intelligence and fixed determination, he left his father's house.
Both the mother and the son were lamenting Dhruva Mahārāja's having been insulted by his stepmother and his father's not having taken any step on this issue. But mere lamentation is useless—one should find out the means to mitigate one's lamentation. Thus both mother and son decided to take shelter of the lotus feet of the Lord because that is the only solution to all material problems. It is indicated in this connection that Dhruva Mahārāja left his father's capital city to go to a secluded place to search out the Supreme Personality of Godhead. It is the instruction of Prahlāda Mahārāja also that if one is seeking peace of mind he should free himself from all contamination of family life and take shelter of the Supreme Godhead by going to the forest. To the Gauḍīya Vaiṣṇava this forest is the forest of Vṛndā, or Vṛndāvana. If one takes shelter of Vṛndāvana under Vṛndāvaneśvarī, Śrīmatī Rādhārāṇī, certainly all the problems of his life are solved very easily.