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The Plan of the Supreme Goddess of Fate and Destiny was quite simplistic, and it carried an incredible risk too, but she seemed rather confident, and it wasn't as if her confidence came out of nowhere. Without Kireina interfering all the time within her own Domain and Laws of Fate and Destiny, and with Genesis absorbing tremendous quantities of Universal Causality, she had grown much stronger, forging billions of Elemental Particles of the Fate and Destiny Elements, boosting her powers through the roof, much higher than just a Supreme Goddess now.
It could be said that the Supreme Gods of Genesis weren't truly at the same level as a freshly created Supreme God, although they had been unable to Rank Up and become World Rulers or beyond in the past, such limitations, placed by Genesis, were long gone.