I am facing 503 service temporarily nginx unavailable

Hi, For The Last few days Website server down the issue. It happens many times a day. Because of this issue, https://speedtest-copel.net.br https://tm-speedtest.com and https://speedtest-copel.com/ are facing the same problem, and also my site’s user experience is compromise. Please guide me, this issue is related to my hosting or Cloudflare.

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