Of course I've tried practicing on leetcode and similar sites and watching youtube videos of problems I've particularly struggled with but nothing seems to help. Over the last couple years I've bombed interviews at Google, Microsoft, Facebook, and Amazon (the first two I made it to the onsites, the last two I didn't even get that far). Anyone have suggestions beyond "just practice more" or "watch more vids"?
In a physical book, make a list of those 10 problems on 5 separate pages.
Start solving them one on each page.
Detach as much as possible from work. Pick tasks that aren't sinkholes for your time.
By the end of 50 probs, you will know better about your strategy and have better ideas on how to take it from there