From Mainframe to ??WHERE??

I’ve been a mainframe applications guy for 30 years. I am the best in the oldies’ world of CICS/IDMS/DB2. Although the mainframe is still “Hangin’ in there”, I need to try and learn some of the new technology. I am looking for members advice on whatto concentrate my effort on. No, I am in no immediate danger of loosing my mainframe job, but I need to prepare for the possibilty. Which way should I head??