Milteniopsis Junit slowly dying

[Jue333]

Hello lovely people,

I have adored Orchids for years and my house is full of them mainly Phalenopsis. Recently have started buying more exotic kinds but I am finding them much harder to care for. My Milteniopsis has classic signs of distress, crinkled leaves and now yellowing. Have put her on a east facing window and I am watering once a week with rain or boiled water. Someone mentioned a stick method to see if I am over or under watering but I’m having trouble navigating. Any advice gratefully received, trying to get this plant to live long enough to see it flower!