White Bird of Paradise Help

Hi,

I’m a new gardener in zone 5a (Stevensville, Montana). I lost some houseplants recently when outdoor temps dropped to 0 Fahrenheit and killed most of what was by my windows. This BoP survived though. I want to reward it for its loyalty! Please may I have some opinions on the current growing scene? Recently repotted with mix I added to pictures. Bought it at Lowe’s about two months ago. Pot is 14” diameter. Also any guesses as to how old this plant is?