I'm not necessarily going to ask you what I should take up; instead, I'd like to ask, how did you come into terms with choosing your major in university or your career if you're already a professional now? Was the decision hard or was it relatively easy?
During high school, I was good at science and mathematics which led me to choosing engineering as a career and I ended up taking mechanical engineering. My decisions were made based on my strengths and my interest. However, I would like to point out that any field on a broad surface level looks nice, pleasant and interesting; but when you actually go into the details, that's when you see the true picture. If you like these details, you do well; otherwise, you will always look to switch. During my undergraduate, I explored all the options in my field and ended up making a list of topics I don't like rather than the topics I like. This approach was rather in a sense thorough as I had explored quite a bit. Currently I am doing my masters and I am really enjoying the research work as it aligns with my interests and I would pursue PhD in future.
To sum up, go through your options, look into the details; even if you don't find what your interested in / good at ; you'll definitely find out things which you would not like to take up which in turn narrows your options and helps you make a decision.
All the best.