Grad student seeking advice

Hi, everyone. I'm wondering if anyone here can give me some advice.

I'm a PhD student who will probably be graduating within the next few years. I'm a physicist working in a ultrafast spectroscopy lab.

My question is basically this: as graduation gets closer, I sort of feel like I've learned a little about a lot of things, but I want to ensure that I'm developing rare and valuable skills that will help me get some kind of position in industry after I finish my degree.

Is a very strong understanding of optics and building optical systems involving things like a laser, waveplates, lenses, mirrors, etc. going to be enough? If not, how can I take this to the next level? Are there any industry-standard optical simulation programs that would be good to learn and master?

Or should I focus more on the theory of solid state physics? This is what I guess I'd say my group is "actually" interested in, but the optical set-up is a highly integral part of this. I enjoy building things and working with my hands which is why I'm leaning towards really mastering optics.

Lastly, is there anything I could do in my own time that would cost minimal money that could also prepare me for a good career?

I guess I'm just looking for some guidance or suggestions. To further complicate things, my group is not highly funded, so it couldn't be anything my advisor views as too extraneous. Any feedback is appreciated.

Thank you in advance!