Your definition of broad and of deep need to be reasonable. Once they are, you can study meta learning, then tackle the things you’re interested in or need to k

Your definition of broad and of deep need to be reasonable. Once they are, you can study meta learning, then tackle the things you’re interested in or need to know. I’m assuming you’re a software engineer, in which case it’s uncommon to do more than 6 hours a day of quality work. Use the other two in a way that lets your mind relax and yet still learn. Balance study and life outside work. Beyond this advice there is nothing else to reasonably do. Sure you can experiment with polyphasic sleep schedules but that’s completely unreasonable for almost everyone almost always.