If you want to study something, don’t focus on UX specifically; study design fundamentals, classic graphic design, and timeless design principles. Focusing too much on tactical design techniques that are digital-only will only serve you in the short term. Understanding Design at large (with a capital D) will future-proof you as a professional — since its universal rules will rarely change.
I find this point extremely valuable and under-appreciated by new designers. It echoes a lot of what I said here. Our industry changes so quickly. The skills that will give you the most flexibility to adapt are the unchanging principles of design. Don’t get too caught up in techniques or tools until you’ve mastered those!