Arya ends season eight on a redemptive path. And after years of vitriol and revenge, peace is an important element to add to her character otherwise she could eventually go to the same extremes as Daenerys. Nonetheless, as a fan of the show, I wanted her to use her Faceless Man skills one more time. Wouldn't it have been wonderful if instead of Qyburn dying a quick death at the hands of the Mountain, Arya tortured him and took his face on her way to kill Cersei?
Better yet, what if after the destruction of King's Landing, having seen the carnage first hand on the ground, Arya steals Grey Worm's face and attempts to kill Daenerys? Now, I know that having Arya kill the Night King and the Dragon Queen is almost giving her too much power, but we could always have Jon stop her so that he can do the task himself. This would maintain the heartbreak of having to kill the woman he loves.
However, I personally believe that having Arya kill Daenerys is just as strong because we would get the repeated image of Jon losing a loved one by the hands of another. Remember, how Olly shot Ygritte in season four, and how Jon cradled her body after she died? Visually, the moments are eerily similar. Why not tie them together with a narrative bow that makes sense and utilises the history of the show?