One of my websites is listed in the Google index (1st page 4th position till yesterday) for the keyword "Mobile app development company".
Today I can't see my website in the first three pages of results (30 results) for the same keyword. What may have happened? What is the reason behind it?
This website is temporarily unavailable, please try again later.
Site is down. (And you're using a 200 status code instead of 503.)
Check that no "maintenance mode" has been enabled and check the server logs for any errors.
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You can check the response headers using a sniffer such as https://redbot.org/ or with "inspect element" in your browser.
The free encyclopedia has an article on HTTP status codes. The status code is what tells the client (crawler/browser) if the request was successful or unsuccessful or if the client has to do something special (like going to a different URL instead).
