Mysterious Exchange: I Become a God Through Trading

Where are the promised myriad realms? The first is the ancient world, the second is the demon realm, the third is the Yin-Yang realm, the fourth is the modern world, the fifth is the underworld, and the sixth is the immortal realm. One, three, and five are practically equivalent to one realm each, so strictly speaking, only four realms were mentioned! There are no human, ghost, demon, or immortal realms; how can you call it myriad realms? It doesn't even include a fraction of the myriad realms.