My job involves static analysis and I have an interest in PLT, so I've found some papers (Abstracting Abstract Machines) that I'll read through and get a rough idea. But to truly understand things I have to implement the ideas, but the scope of what I want to do expands so fast that I get demotivated and eventually move on.
Categories for the working mathematician, Software Foundations, contributing to mathlib are all things that I sort of start working towards and cannot force myself to get to any meaningful conclusion. At the same time starting so many things is how I slowly accumulated the foundations necessary to even approach these things.
It doesn't help that I also have PDA autism, which leads any sort of structure I try to impose on myself eventually becoming too stressful. I feel like I've reached the extent that modern medicine (I'm just short of max dosage of XR Ritalin) and therapy I can afford can help me.