Future of Programming Language: Julia or Swift?

Hi, I’ve been researching in Computational Intelligence and Machine Learning. I already know Python, and it solves a lot of my problems. Therefore, I need a faster programming language because it involves many loops and data structures that could not be solved by vectorization. So, I looked for a scientific computing language and found Julia, and it was sufficient at that time. Think about the Future … What do you guys recommend to invest my time in learning another programming language? Continue learning Julia or start studying Swift?