It Is possible to choose your own private mantra, and you will discover generic mantras to pick from. Dr. Chopra’s ebook has 52 of these. Oṃ namo bhagavate vāsudevāya: "Om, obeisance to the illustrious Vāsudeva (Kṛṣṇa )." This mantra is The most normally recited by Vaiṣṇavas, followers of different sects https://www.youtube.com/@Mahavidyabaglamukhi/shorts