Comment by LogicalBorg

Since you already have a job role in mind, I suggest that you take a look at at job applications in that area, for example on https://www.indeed.com/. Look through the job requirements in various listings and see which languages they require. They probably mention a lot of non-language requirements as well that you should be familiar with. Don't just focus on learning a bunch of languages. If you do, you will be overly strong in languages and weak in other areas.