How deep can I plant this Phal?

Hi forum!
I am struggling very much with my very first orchid, that of course, went through total roots loss, since I had no clue what to do with it. Since it is first orchid in my collection, I am trying very hard to keep it alive, but the picture is sad for now. My question is: how deep i can plant it into the media? It lost quite a lot of leaves on the bottom, and now I have naked stem with several roots sticking up in the air. Can I plant it deeper, so these roots can go into the media and be useful in hydrating the orchid? right now it has exactly one root in the media, and it is not enough. I am worried about potential rotting of the stem, it will definitely not survive it ..

 

Thank you for the replies! The root in the media is not alive any more... I did replant the orchid deeper now, so the dead root is removed, greener roots are a bit deepened in the media, but I just put the bark around them: they have always been out in the air, sk I am not sure how they would take more water- keeping media. This bark around the roots dries very fast though.. I run a bit of water through it almost every day now. But plant is getting worse. Should I try to fill the pot with water and keep it like this for a couple of hours?
To answer the questions: the plant was a present 4 years ago, it is my first orchid. So it is my subject to every possible mistake and error Normally I keep phals in bark (watering with soaking for ca. 10 min) or mix of bark and little bit of sphagnum.
Now I reported this orchid in the bark with a bit of sphagnum, but no sphagnum around the roots. Leaves started to yellow now, it doesn't look good... And yes, it is a little keiki, with no roots. The little flower spike is not growing, it froze the way it is. If it starts growing, then i am definitely cutting it off.
Any suggestions what else I can do?

 

forgot to answer some of the questions: pot has side ventilation holes and bottom drainage, but top, where the roots are, dries a lot faster than bottom, but there are no roots on that "bottom", so I don't care about it now. Pot was chosen this size to fit the wide roots that are not flexible at all...

 

Thanks for the advice! How do I do it? proportions?

 

so you take any vitamin-B complex and dissolve pills in water until it is yellow? And the soak plant in it of just run through the pot?

 

Uodate: I can see new roots starting on this one! very exciting!
Plus another good news for me: I have a phal that has stem rot and all that I was able to save were top 2 leaves. I read that in this case the orchid has no stem left, so it has nothing to grow roots from, but it doesn't hurt to try, right?... and today, after almost half a year, see what I notice:

Let's hope

 

thanks

 

Just an update: orchid seems to start to recover, two remaining leaves are quite hard now, and it is shooting several keiki... so far so good:

Plus the one with two leaves and small root tips, from the previous message, looks like this now:

it is a good feeling when things go the way you want them too