Praying is slowly dying on Itunes (I think it's going up on the radio nonetheless, no?)
Anyway, they should think about releasing the second official single very soon. This month or beginning of November, otherwise it's going nowhere (which would be sad after such a good start).
I'd release Rainbow as the second single because it has the same vibe as Praying, it's uplifting and it could work well during the November-December time. If she does shows during December and performs Praying and Rainbow, I think everything could benefit (the two singles, the album).
The album still has so much potential especially in the US, Canada & Australia. They should work on a plan to "milk" it during Christmas period.