Ask HN: How to prepare for full stack interviews

I have not felt prepared for any interview I’ve done because the variance of questions I get asked is just all over the place. Sometimes it’s a really specific React question or problem to solve, sometimes it’s doing more of a system design question where I have to go pretty deep into how something like Kafka works, other times it’s just a LC hard problem. I just don’t ever feel like I can prepare enough to really ace the interview because the breadth of what I can be asked is just enormous. I don’t do poorly when answering these questions but I don’t do exceedingly well enough to confidently pass.

I also feel like this is partially my fault for not specializing more in an area. A lot of the questions I get asked seem to be geared towards someone who specializes in one thing or another and because I’m more of a generalist I don’t know the answer to the same amount of depth that someone does who has just been focusing on an area more.

Do I just pick a direction either frontend or backend and learn to be really good at this instead of trying to continue to do everything? A lot of the roles I have interviewed for have just been normal SWE roles though and I still get wildly different interview formats and questions