I really enjoyed practicing on Pramp [1]. I ran through their whole batch of problems (roughly 40) so I can't schedule more interviews, but it helped me a lot to work on the soft skills required for FAMG type interviews. Unfortunately I still didn't pass the Google interview (had on-sites in Zurich) even though I was very well prepared. I also maintain (sort of lol) a list of interview preparation resources [2], although I find [3] to be even better.
PS: I also failed much easier interviews at CrowdStrike and SourceGraph so maybe I just suck at being interviewed in a way that's not clear to me. It really takes a toll on your confidence though.