At the start of the process, I began with comp sci/DS&A fundamentals - including books like Algorithm Design Manual, Intro to Algorithms, etc. Took a few months break to get married, then resumed, eventually starting to 100% grind leetcode problems. As my wife can amusingly attest - I no longer have any hobbies or other personal entertainment since we got married. Studying for interviews consumes all the free time I have that I don't spend with her.
Add to that, since last year, my day job got a lot less demanding, so I am actually studying/leetcoding during the afternoon at work too.
One wrench thrown into the loop is that I am a mainly a frontend engineer by trade, and it seems frontend interviews at FAANG and many other top tech companies are focusing less on leetcode/DS&A and more on JavaScript trivia problems. So that has been a context shift, and I am focusing more on getting as many JavaScript tricks and patterns into my repertoire now, and less on leetcode.
Pretty much my #1 personal goal in life at the moment is to get into a FAANG, or at least similar caliber, company. No, it's not a life or death matter, but whereas someone else might be content to watch TV/Netflix, or play games, or go golfing, I'm spending that time leetcoding...
What I feel torpedoes me during the interview is that I can get often get 90%+ of a solution, even if it's a problem I haven't seen before. But some edge case or bug in my code kills me, or I miss some trick or pattern that is the key to getting it right. In a less competitive company, this might mean passing the interview, but for a FAANG or similarly highly competitive company, I feel not getting 100% technical perfection means dead on arrival.