Why is my Miltassia Royal Robe 'Jerry's Pick' AM/AOS not thriving? Light leaves

[ethanpw]

This is my first post! I hope this is the right category.

I've had this orchid for about 9 months and it hasn't been doing well. I can't quite figure out what I'm doing wrong. I repotted it in orchid bark after I got it. I water about weekly. It was in a shaded North facing window then I moved 5 months ago and put it in a very shaded NW facing window. One of the smaller, I assume newer leaves yellowed and died. It's leaves are a lighter green than photos I see of other Miltassias.

Perhaps I'm not watering enough to keep it moist?

https://www.orchidweb.com/products/m...maos~1809.html

I got it very cheap so if I lose it, it will be a learning experience. But hopefully I won't lose it!