Decide between mobile dev, web dev or data science or any other field.

During my bachelors studies I have been developing Android Apps and have done it for 2 years. Now I am in a dilemma, I am unable to decide which field to move into, should I do mobile development, web development, data science or get into any other field such as Cloud Computing.

Before writing a one liner such as "Do what you like/love", I am in a mindset where I can do anything if I invest time in it, just unable to decide what to do. I am looking for something that has future prospects.

Open to any field in Computer Science.