Yes, certification is definitely a good investment in your time. The Professional Architect curriculum was updated in Q4 2023. The content reflects the IBM Cloud offering today. There are 3 levels of ICCT curricula: Advocate, Professional, and Advanced. The Professional reflects the intermediate level. It would be appropriate for Architects and Technical Sellers with 1-3 years experience. If you want to review Technical Advocate first before you dig into Professional Architect, you could see the course titles and decide which one is right for you.
There are online learning courses, a study app, and PDF study guides that you can use to assist you on your journey to certification. Some people use the study guides with practice questions and others primarily use the online learning. Goodluck and let me know if you have more questions.