Hey,

It depends on your interest whether you want to study Python, Java or Javascript. It is because if you know your strengths and work on them, you will surely do much better in future. Choosing a language not of your interest and just based on more scope will result in a lack of interest and ultimately you will not be able to concentrate and give your best. So, even if any course has immense scope, still you will not be able to give your best output.

You try three of them and whichever you find more interesting, you can move forward with it.