this depends on what current Pega skills you want to enhance, or what new Pega skills you want to learn.
For example, I see you are CSA certified. Have you considered the CSSA (Certified Senior System Architect) certification? As for new skills, you could consider the Pega Certified Robotics System Architect certification.
@SoumitraG In addition to the above certifications, recommend the Pega Express Delivery and Low Code App Builder (8.6)missions. This will keep you current. They are not a certifications but once completed you will be assigned the mission badge.