Should you gain more experience with front-end, especially Javascript? Yes. Should you change career paths to front-end? Absolutely not. Front-end is just that

Should you gain more experience with front-end, especially Javascript? Yes. Should you change career paths to front-end? Absolutely not. Front-end is just that; web development. With Java and Ruby experience, you're not stuck to just web development but can branch off into other fields much easier.