Phal with leaf discoloration- need help diagnosing

[Klup]

I’m new to orchid care, and this phal developed discolored areas on both the tops and bottoms of leaves a month or so ago. I’ve isolated it, cut off discolored leaf tips (treated cut areas with cinnamon) and treated the whole plant with a copper soap spray around 2 weeks ago. It seems to have possibly stabilized (?), but I’m not sure what’s wrong, what to do next or if I need to worry about my other plants. Thanks for any help!