It sounds like you haven't really been pushing yourself out of your comfort zone, and instead have plateau'd in terms of growth. Pick something that you find i

It sounds like you haven't really been pushing yourself out of your comfort zone, and instead have plateau'd in terms of growth. Pick something that you find interesting, and go really deep in it (read books on the topic, develop OSS oriented around it). For a mid or senior level engineer, companies want someone with a broad enough set of skills that they can tackle most problems given to them, but also has a deep knowledge of one or more areas (which adds to the collective group of talents among the engineering team).