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To fill in the ranks of the missing Supreme Gods that had abandoned the World, Genesis had to quickly fill up the places with equally powerful and old gods. Although they couldn't quite compare to the original Supremes, Tsukuyomi and Amaterasu both possessed hundreds of millions of Elemental Particles refined from living in the Moon and the Sun respectively for millions of years, constantly refining its essence and growing more powerful, a method every Moon and Sun God usually did.
Therefore, although they didn't quite fit what was needed, the power of the Moon and the Sun turned into powerful Laws that bound Genesis together, strengthening the world's foundations as they were crowned by Genesis herself, a reward and also a great responsibility. Perhaps in the outside universe becoming a Supreme God wasn't the end of the road or something that was as incredible, with the existence of World Devourers, Star Eaters, Black Hole Kings, and more.