It is impossible to help without seeing some of the error logs, but you can at least check this: Check for mixed content. If your PHP script is trying to load resources (like images, scripts, or styles) over HTTP your browser will block it. If you are using an AutoSSL certificate, try generating a new one. Also check to see if the version of PHP installed on your server is not some ancient version. Check to see if the GD library is enabled.
You can also try removing the @ operator before imagecreate() to see if there are any errors being suppressed.
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