Hi, you seem to be doing all the right things so far
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As the sensitive roots have been disturbed by the repotting process you should water sparingly until the roots become established again. In addition to the humidity tray you could also mist your catt regularly with a small hand sprayer thus giving extra moisture to the plant.
Keep the roots shaded for a few weeks to protect from further damage. Also do not feed for about a month. Then half strength orchid fertilizer every two to three weeks