I quit my job to start the year and I'm currently doing a sabbatical year. I'm apathetic about the idea of eventually honing in on a specialty to learn when I re-enter the workforce because I'm unsure how sustainable the skills I learn will be in demand for.

The only thing I can think of is expanding my base level understanding of LLMs. My bet is that they will become the foundation with which future projects are launched in the same way that elementary school is the foundation for basic reading/writing skills.