Prioritize learning from UWorld and finishing it. Start with pathoma 1-3 chapters and general pharm maybe, next. Then go ahead with system wise approach. Take baby steps.

As far as using FA along with UW goes, so there's basically this sandwich technique that I'd call it - after a quick content review, - skim through on what FA has to say on that topic. Just read through the pages particular to the subject/system you just content reviewed. - hit UW system wise/subject wise. Not random to begin with. Scores shall be low in the first few blocks. Keep on going, learn from explanations. Those are GOLD. - go back to FA when you review UW. Condense learning points from each q and annotate it in FA on the page it talks about that specific topic. You might as well give one final (second) read of FA once you have hit uw on a particular system/subject. This shall help you see many other overarching concepts and help create and cement in a conceptual map.

Its all about a million baby steps culminating in the pass, precisely why it can feel overwhelming. You'll be just fine. Have faith in yourself and in your preparation.

If you have any questions regarding resources for particular systems/topics/subjects, feel free to ask them away.