I have no clue what working at FAANG is really like, but from the comments I read it is said to be very much an "up or out" culture. So I wonder how it is even possible to stay for six years with only one promotion and how long this is going to go well?
It's not. You need to get one promo from L3 (new hire) to L4, but once you're there and still hitting your OKRs (loose team targets), you pretty much set the pace.