I would also suggest auditing an online course on operating systems. That shouldn't take much effort (compared to actually doing the associated homework etc), but gives context, a good overview of a lot of fundamental concepts, and probably enough CS trivia to be useful in an interview.

Once you have a job, then I'd focus on learning theory. You'll be learning by doing all day in the job, so there's less benefit from side projects than continuing to learn theory, at least until you've covered everything in the undergrad curriculum. You can look at the degree requirements from a couple of the big schools, choose a list of topics, then pick one or two sources for each topic. I used a mix of online courses and textbooks.

The fastest way to get into the industry is doing projects. However I would take the specific approach that some other member posted here. Find local companies near your area, research their product and build a programming project that is related to their business. Then email them directly to a few key players of the company to showcase what you did.

After you get the job, you can start focusing on CS theory. There are tons of materials online for CS theory such as Coursera, Udacity and edx.

Good luck!

[0] https://firstdevjob.com/posts/why-build-portfolio