In the modern world we define ourselves based on an idea that was created during the industrial revolution. The idea of a highly specialized workforce. Everyone has an area of focus, and you master it to get ahead.
While this is still true, and easy to benefit from, it will not last for much longer. Even looking at software development job postings, we see a high demand for full stack developers. It’s not enough to specialize, you need to not be able to define yourself easily. You need to be a complete human being.
Travel the world. Learn another language. Get into trouble. Increase your vocabulary. Exercise more.
These things matter more than being an expert in one, narrowly defined thing.