I have been unable to create an a new account for a couple months. The site says wait and try again. It will continue to give me the same problem every time. So I gave up on making a new account and took a break from playing.
I have moved your thread from the Old School RuneScape General forum into the Community Led Technical Support forum.
As you are experiencing a technical issue with account creation your thread will get better exposure in here.
I recommend you read through the
Website issue
support page. There is a contact point at the bottom of that page if you want to message Jagex Tech Support.