Service Temporarily Unavailable

I am not being able to access my website or even the wp-admin. If I try to go to the website, I get the following error message.

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
Additionally, a 503 Service Temporarily Unavailable error was encountered while trying to use an ErrorDocument to handle the request.

I think, this issue started when I accidentally removed the logo image from my media library from the dashboard. I don’t know how to go about solving it. Is there a way to solve this? Thank you.

My website is on a Child Theme, based out of Customizr (latest version).
Here’s the link to my website: projectparampara.com