From the developer mode, it seems that cloudflare has completed the proxy, but the backend server responded with a 404. This does not seem to be an error on cloudflare. If you are the administrator of the backend server, you may want to check Whether the backend server does not have the corresponding location of premthakur.online, another way is to disable the proxy first and see if it works properly.
Try changing the proxy to DNS as shown in the picture, and then check if the website can work properly (it may take 30 seconds to change). If the website cannot work properly under DNS mode, you need to solve this problem first, which means that the website is not connected through cloudflare. It’s already abnormal.