How to prepare my self for the future challenges in career

Question

Hey All ,

 

I have 7+ years of experienced full stack developer and having knowledge and hands-on experience of Dot net technologies like 

C#,ASP.net MVC, Web API & WCF

Knockout JS, Reach JS(+ Redux) & typescript 

Bootstrap & Foundation UI 

SQL server (certified in 70-461)

 

Now, I would like to learn a new technology which boosts my career. Can you please guide me on it.