Your DNS record is proxied and so Cloudflare IP addresses are returned. See here…
A 524 error means Cloudflare is not getting a response from the server in time. To debug, set your DNS record to “DNS only” instead of “Proxied” and see if the timeout still occurs (you won’t see a Cloudlfare error, just a long wait). If so, contact your host and get them to fix it. Once fixed you can re-enable Cloudflare again.