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There are many things that cause this, and unfortunately, your photo did not come through. I can take a few guesses, though.

They are sensitive to bright light, low humidity, temperatures nearing the lower end 50 degrees, and over/under-watering. On top of this, they require regular feeding.

Leaf drop can indicate that the humidity is too low to sustain growth. It can also tell you that the temperatures are too low to sustain growth. Sometimes they drop leaves when they are watered too much, or when they dry out completely for too long. This can also happen if it has gone more than a few weeks without foliar feeding with an orchid fertilizer. Light can also play a factor. Both direct sun, and full shade will cause leaf drop, so they need to be in bright , but filtered light.

This article will help you with the care of Orchids: https://www.gardeningknowhow.com/ornamental/flowers/orchids/indoor-orchid-care.htm

Our article says both ways work. (2 days soaking, 5 days drying or water 24/7 and changing water every 1 to 2 weeks).

You can go from hydroponic to bark mix, but success will depend on whether your orchid grows new roots for its new environment or not.

https://www.gardeningknowhow.com/ornamental/flowers/orchids/growing-orchids-in-water.htm

This will be hard to diagnose without seeing the damage. I will give you the most common issues that can cause this. Without knowing its care, and seeing the exact damage, I won't be able to get you very far.

Too much or too little light will cause these symptoms. They need bright, but never direct light.

Too much too little water can cause this, as well. Too much water will suffocate the roots, leading to droopy plants, while too little water will starve them, leaving them droopy as well.

Too little humidity can cause wilting. This can be corrected by adding humidity.

Planting is soil, rather than orchid mix can cause wilting.

Too much or too little nutrients can also cause issues.

Unfortunately, they have some pretty strict requirements in order to keep them alive. Without knowing the conditions where the orchid resides, I can only give you examples of what can cause wilting.

This article will help you, further: https://www.gardeningknowhow.com/ornamental/flowers/orchids/indoor-orchid-care.htm

You just leave them. That is how they are supposed to look.

Here is more info:

https://www.gardeningknowhow.com/ornamental/flowers/orchids/beginner-orchid-growing.htm

https://www.gardeningknowhow.com/ornamental/flowers/orchids/orchid-planting-mediums.htm

https://www.gardeningknowhow.com/ornamental/flowers/orchids/orchid-water-requirements.htm

https://www.gardeningknowhow.com/ornamental/flowers/orchids/tips-on-fertilizing-orchids.htm

There are several reasons why an orchid's leaves would turn yellow, unfortunately. It would be very difficult to give you a direct answer without knowing the conditions that are provided for your plant, but I will give you the most common problems for orchid issues.

Underwatering, and overwatering can both cause yellowing leaves. They should be kept in an orchid mix, or they should be affixed to a tree. They will not do well in soil and will be overwatered. If the roots are not kept moist, but not wet in an orchid mix, then it will cause these symptoms as well.

Not enough fertilizer will cause yellowing. They need to be fed at least once per month with a half strength orchid fertilizer, or a VERY VERY weak all purpose plant food solution (Not recommended since it is really easy to burn them)

Overfertilization can cause yellowing and then browning. Make sure to feed them according to the orchid fertilizer packaging to avoid this.

too much, or too little light will cause yellowing. Usually, yellowing is more common with a lack of light, but too much light will cause bleaching and burn.

They should be kept in bright but indirect light.

Humidity will be important, too. They need quite a bit of humidity to remain happy.

This article will help to care for orchids: https://www.gardeningknowhow.com/ornamental/flowers/orchids/indoor-orchid-care.htm

It is probably best to repot before the new buds bloom, although you may have to sacrifice them in the process. Here's an article that should help:
https://www.gardeningknowhow.com/ornamental/flowers/orchids/repotting-orchid-plants.htm