I just checked right now and it would seem to me that gamdom.com is up and running perfectly. I am not sure why it does not work for you. Perhaps you have some kind of internet restriction to gambling websites in your country? Although if you do, I would not recommend trying to bypass it with a vpn since your account might get banned that way and you would still need to do KYC in most gambling sites.

You can try out Roobit, Rollbet, Fortunejack, basically any and almost all gambling sites are easy to sign up on. But if you can access them depends on your countries restrictions.