I get the impression you are not technically challenged at your work. Not an uncommon dynamic when working for a company for which software is a means to an end

I get the impression you are not technically challenged at your work. Not an uncommon dynamic when working for a company for which software is a means to an end. In order to dig deep into one area, you might need to take on a "hobby" project that forces you to deep dive in a chosen area. Looking at your current areas of experience, I would choose either GPU or DSP programming. By being CPU adjacent areas, specialist skills are more likely help your career.