What to do with my Dendrobium formosum?

[Kesorkol]

Hi!

So I’ve had this guy for a few months now and during that time he has done absolutely nothing!
When I first bought him he had a few leaves at the tip of the cane, but they have all died away. Oh, and he also has no roots at all.
(Why did I put him in a pot?)
I’ve kept him quite wet and I was hoping he might send out some new roots, but he hasn’t so far. He also doesn’t seem to be shrivelling and he is still very firm.
I really don’t know what to do with him!
I would really like him to send out some new growth!
Any help or suggestions would be very much appreciated!

Thanks!