How to change my technology?


I am having more than 11 years of experience in Mainframes basically in Banking domain. I am a developer and basically in coding in all these years. I am interested to learn a new technology. what career option do you recommend? As I cannot just ignore my 11 years of experience and start my career as a fresher, I would like to know what can be the best move which can add value for my career in mainframes.