Not everything in the world needs to be decentralized, despite what your local snake oil ICO salesman might tell you. However, there are more than enough significant institutions and processes that can and will function better with a little bit of distribution, decentralization, federation, etc properly baked in at key friction points. Building that future is a worthy and potentially lucrative cause. I know I'm speaking incredibly broadly, but frankly I had a similar question as you some years ago but without the benefits of being a full stack engineer.
Disclosure: MSc in Digital Currency holder.