Left Alone For A Billion Years; I Will Become The Strongest

***** dies and gets the chance to reincarnate. However, in the middle of her reincarnation, she is left alone in god's realm for a billion years. Having long forgotten her name, she continues to swing her sword... This is my first story so don't be too harsh, ok? **Story will take some inspiration from 100 million year button and Everyone else is a returnee