As an ICU attending (albeit the PICU - but there's not that much different between critically ill patients at any age), I'm a bit flabbergasted that you can say "there's only so much I can read about my patients".
Now, granted, you're green beyond green, and there's an element of knowing what non-critically ill patients look like that makes the ICU stand out. So I'll give you that youre in a challenging situation in trying to determine what's important and what isn't. So here are some thoughts about how you can improve.
1) Your mindset from now until the end of intern year should be that every patient has something to teach you. That's moreso true now, then it will be 3 years, but there's so much growth to happen in front of you, that it shouldn't be hard to find something that you didn't know before or didn't do as efficiently as possible.
2) Working on your clinical skills that are widely applicable to ANY clerkship or specialty is so incredibly high yield for you at this stage of the game. That means efficiency in gathering data, conducting a physical exam, writing notes, creating differentials, creating treatment plans, and so on. Pay attention to how your senior residents take a history and how you take one. Odds are yours takes an hour, theirs takes 15 minutes and contains a lot more useful information than yours.
3) Studying for the shelf exam or Step 1 will always be there. But you need to take advantage of things that are unique to the ICU - that means Ventilators, Blood Gas interpretation, how the various pressors work, why CPR is effective (or not), and the physiology of sepsis those are bread and butter ICU topics. Unlike 90% of the rest of medicine, the ICU is where all those physics formulas and concepts you learned in CV and pulmonary physiology actually come out to clinical importance - if you can understand those again in clinical context you'll begin to see why people make the decisions they do. In effect, you are studying for step one if your putting your effort in to the right things. Additionally, watch how your residents and attendings give bad news - it's obviously common in the ICU, and something that nearly every physician has to do in their careers. The more you watch other people, the more you can begin to create your own style for when it's ultimately your responsibility.
4) It's hard when all your patients are critically ill, but begin using this experience to develop that "sick vs not sick" radar. That's a critical skill for new interns as you need to know when to bring in more resources. Talk with your seniors about which patients are they worried about vs not and then ask why that's the case, and then ask what sort of things they'd be looking at for patients on the floor prior to transfer (the subtle cases, not the ones that post-arrest that everyone knows needs the Unit).
5) At least start seeing procedures for your "see one, do one, teach one" moments. If nothing else, have someone teach you how to bag valve mask patients. It's not so crucial you know how to intubate, but if you can bag someone adequately, you'll save a lot of people.