I faield all FAANG (OA, phone) interviews, what am I doing wrong? :(

Hey,
I started interviewing at FAANG companies and didn't even made it to the onsite. I failed mostly at online asignments and virtual phone interview stage. I don’t understand how I lack so much knowledge, I've done about 400 problems (leetcode, algoexport + solved some problems multiple times) .
I do not follow any specific study plan. I mostly solve problems with labels in which I felt I lacked knowledge. When I study If I can’t find a solution in 10-15 minutes, I’ll look at the discussion tab and examine how and why a particular algorithm or DST was used.
I had a phone interview today and got stuck in one problem, I just couldn’t figure out how to implement a two-pointer approach. Sometimes I feel like I’m freezing at an interview, I don’t know it’s weird.

Sometimes I feel so stupid why I can't learn these algorithms ...
Do you have any tips for me or if you could tell me how you did with leetocde, which would be very appreciative.

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