Need to change technology stream

I have total 15 years of experience in IT Services industry. I have worked on Mainframe Technologies for most of my career. I want to change my technology but I am not sure how to go about it as there is so much information I get overwhelmed. Any advice on how should i go about it will be helpful. TIA.

Do you know what type of work you want to transition to? What is motivating your change? What type of job do you want to have when you’re done?