The first thing I would do is cut the last 4 pseudobulbs from the back off the plant and all of the dead roots as well. Throw them in the trash o.0
This leaves you with your front four pseudobulbs (new growth included in the count).
Next, some new media preferably hydroton or Aussie Gold and a smaller pot; probably about half the size you currently have. I would prefer a clear pot with side slits or clay. You can soak/wet the media in water with KLN or Superthrive to promote root growth.
Use a rhysome clip and stake to FIRMLY secure the plant to the media. (As you have trimmed most of the roots off and will need mechanical means to set the plant.)
If you do not secure it firmly, you will never get any roots, period.
Keep humidity high and water normally.
Keep the plant kind of warm...about 75F to 80F
Your plant looks extremely viable. Trim your roots up nice and neat....leaving all those dead roots will promote rot and decrease the stimulus for the plant to grow new roots.
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