How do I encourage Bulbophyllum to grow roots?

[Dragon Tamer]

Hi, I think my orchid Bulbophyllum Macranthum root system is shot, I haven't seen any growing activity coming from this orchid, I think the root system is stuffed, how do you encourage roots on this particular bulbophyllum to grow? root hormone gel? or? moss? or? or?

Thank you for reading, p.s I think i should had watered it more and gave it more humidity, I will learn the hard way, otherwise the plant looks healthy with dark leaves, the orchid is facing east to south east, partial sun, be gentle with me, thanks.