Become a synthesist. Everything is related to everything else, including all your interests. Find the common connections and weave it all into a whole. There are few people who can see many sides of everything and while the world often doesn't acknowledge the need for such people, they are the ones who are responsible for a good part of the advancement of the world. Being a software developer fits well with electronics and math knowledge. Knowing electronics and math fits well with music. Sociology and psychology can be studied with electronic wireless sensors and smartphones, which requires software development and electronics and data analysis. Birding and hiking/camping teach you about nature and survival, which are useful for understanding the environment, animals, people, and climate change. Wireless sensor networks can be used to study climate change and requires software and math. Learning physics can be a gateway to math, electronics, chemistry, biology, geology and more. People who only know one narrow skill have a harder time creating anything practical and widely useful to people. A typical example is software developers who don't understand how people actually use user interfaces, which results in unusable software.