You can try applying cold water (near about ice cold but not ice) to your orchids after their establishment. I did it for my orchids and they are showing satisfactory growth.
The majority of orchids do not tolerate direct sun, they need to grow in semi-shade, in a place with free air with air flow, a lot of humidity, they do not grow on the ground, it is necessary to sow them in baskets with pieces of wood logs as a substrate. You also have to apply a foliar fertilizer every month so that the plants bloom and grow well.
I'm using the ficus bark, charcoal and sphagnum moss as a substrate and growing them in a proper pot that has a lot pores for air circulation. Louis Zapfack
Well Mr. Lalit Bc if you are growing naturally, agreeing with Tridip Boruah and Luis Miguel Constantino , I suggest you - try to keep them in shady place and spray cold water, try to maintain high humidity. Using mango tree branches (dried) as substrate may show satisfactory result in some Orchid species. Rather than spraying cold water only, you should spray diluted (0.25x or 0.5x) Hoaglands solution (preferably cold) for a few weeks at the initial stage. Choosing a substrate depends upon the Orchid species, as different species love different substrate for well growth.