Architect II is the highest certification available to customers. The highest overall certification is SCC2 (Splunk Certified Consultant 2) which is much more rigorous that the architect certification.
I pasted the track below to get certified and the order of classes. Judging from your previous posts on Answers, I'm confident you can obtain the Architect II cert with no issues
https://www.splunk.com/view/SP-CAAAJDH
