So, let's talk about why a bunch of KF accounts are popping up on Bluesky to begin with. What they're doing is target hunting, and the signal they're looking for is reactions. They're looking for reactions because, spoiler alert, there are not as many of them as they would like you to think.
They're also not as good at what they do as they would like you to think. The vast majority are lazy. They ARE dangerous, but they are opportunistic. The best thing you can do is to not publicly freak out or react if a KF account likes your tweets, follows you, or DMs you. Block them, move on.
Now this doesn't apply to everyone they target, unfortunately. It is sadly true that for some folks, they can ignore KF and "keep their heads down" all they want and KF will still go after them just as doggedly, if not more so. But those folks have a higher risk of being targeted to begin with.
The best way to not end up on their radar is to deny them the satisfaction of them knowing that you've noticed them, or that their automated bot is making you feel unsafe. It has liked 100s of posts in an hour; they can't & won't focus on you specifically unless you tell them the attack worked.
