Sol lost an important reason to use her because of a recent update, the atk down cap being changd to -50%. Sol still has other uses, mostly as support healer but that may be something you don't even need, maybe if you go thunder, and her abilities are povided by many others depending on which team you want to go with. With Yatagarsu coming again in a couple weeks, you can fairly easy hit the debuff cap.

Id suggest you keep rerolling until you get 2 SSRs of the same element or Belial or Kirin with an SSR of their element.