Error: 520 Web Server Returning an Unknown Error

My website URL is:

What I’m seeing is: The Error stated in the title.

I’m using this software: Chrome Browser / Android Devices

Additional information: I am getting a lot of errors, the website is working very slow again and the error is showing frequently. 2 days ago, website speed was 8s only, now its more that 19s. Please help. Is it again a Ddos Attack?

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