What are you trying to do? Just stimulate and challenge yourself? Or are you trying to get a better job? It does not sound like you have a passion for compil

What are you trying to do? Just stimulate and challenge yourself? Or are you trying to get a better job? It does not sound like you have a passion for compilers and OSes. Neither do I, so I don't try to deeply understand them. There are plenty of other areas that do interest me. Don't force yourself into something that is not particularly interesting to you.