There's only one Brahma or Hiranyagarva in each cycle of the universe. In Vedanta, what we call the cosmic mind is consciousness associated with all minds. You cannot hope for anything more than that. This itself is beyond our imagination. The limits of desire,. Jagatav Pratishtham, the foundation of the universe and you are the foundation of this universe.
Swami Sarvapriyananda teaches the Katha Upanishad, which is one of India's most revered texts and a part of the Vedas. It is a collection of philosophical poems representing a conversation between the sage Naciketas and Yama (god of death). They discuss the nature of Atman, Brahman and Moksha(liberation).