Better salaried tech stack

I am working in SAP as full stack developer from past 15 years and getting only 35 lakhs ctc. Whereas here in grapevine i can see salaries ranging till 2 crore or so for software engineers. How can that be? I am interested in programming and want to know for which tech stack salaries are best. Means , generally popular programming languages like java programmers also earn more? Or is it just me who is not able to earn more?please help me with good tech stack