Trending @Infosys; Career Path advice needed...

Dear Friends, I am working on .net tech and I have experience in .net mvc, sql and web API. Now that .net core has taken the place of mvc, I don't know what to learn going forward. I mean .net feels complex, I don't have experience in other tech like java python angular node react etc. should I continue in .net ? Kindly help me what should I learn going forward so that I can stay safe in current market conditions and also get job opportunities if I have to change company. I don't know what to learn for interview. Kindly guide me. Thanks in advance.