there is no other subject in Bhagavad-gītā than devotional service.
The term for the fifth goal of life, subsequent Moksha or Liberation, is Bhakti which is translated into English as "devotion".
The Sanskrit term is given by the characters{"भ", "क", "्", "त", "ि"} withCharacterName[ToCharacterCode["भक्ति"]] in Wolfram Engine 13.3 giving ["DevanagariLetterBha", "DevanagariLetterKa", "DevanagariSignVirama", "DevanagariLetterTa", "DevanagariVowelSignI"} and these strings are found in the Unicode 15.0 Block "DEVANAGARI" (23rd) on the 16^^00 Plane.
Going beyond the "mumukṣutva" of those seeking the knowledge of the truth of oneself, service evades the primary goal of the quest for freedom with only present-moment exaltation and self-less worship of Kṛṣṇa (The Supreme Personality of God-head), the avatar of Maha-Vishnu.
Note page #118 of Swami Dayananda's "The Value of Values" published by Arsha Vidya Gurukulam from "Knowledge is the only means to freedom" in the purportive body of text elaborating upon and extolling the last of the twenty attitudes or values the mind must have to adequately prepare for Understanding "Keeping in View the Purpose of the Knowledge of Truth" with the author transposing the 19th and 20th terms (19 then being terminal), instilling the mandate that study of scripture must be constant— an aspirant being adamant about restoring their relation with Parameśvara (Impervious to the contamination brought about entanglement with the material world/Maya and the delusion of finding identity in the mind-body construct).
