A few weeks is nothing in the life of an orchid. Progress is measured in months, and happens slowly. How often are you watering it? In my temperate climate I would say repot for sure (best when you see new growth and new roots starting) but where you live, it may be ok in that bot. But the roots don't look great, so a repot woud likely be reasonable. But with no medium, unless it is getting rain every day or two, you do need to be watering it - it looks somewhat dessicated, but that can be caused either by insufficient watering, or by bad roots that can't take up water. But don't expect instant "feedback" when you change your treatment, it takes a long time - and if it was underwatered, the leaves may still not perk up if you increase it, but new growth will be healthier.
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