To tap into the 3 energy, one indulges in the creative, intuitive, and sometimes materialistic aspect of one's spiritual connection to Self, World, and Cosmos. Energy is purest as Binah(understanding) is revealed. Mother/Femme/Goddess energy expressed as Higher Understanding. Intuition.
To tap into the 12/3 energy, means inability to express, surrender to Highest power of outcome in relation to Cosmic POV - What happens you trust in the Higher power to express for your benevolence. Surrender, sacrifice for one's ideal.
To tap into the 21/3 energy of 3 - one seeks its' place in the world as an inner expression of self beliefs - i.e. systems. In seeing all energy on an intellectual level, one understands its' place in the cosmic agenda on a worldly level. Developing a business based one's hunch is favored.