I imagine it could be for many reasons, one, which other people have mentioned, is simply the seasonality and cyclicality of recruiting. These things can literally change over the matter of weeks so I wouldn't sweat it too much. The other potential reason, and admittedly the one that might be more cause for alarm, is the fact that there are many layoffs going on so there is a supply of engineers hitting the market . Based on my own anecdata, I don't think there's a reason to freak out. It could very well be that there is more supply than there was before, but the hiring market is still quite strong and there are roles out there. You just need to keep looking and connecting. I know that a lot of people like to rag on recruiters ( myself included) and there are a lot of annoying recruiters out there because there is such a low barrier to entry, but every once in a while you will come across a very helpful and industrious recruiter. They're usually happy to jump on the phone and you can view it as an opportunity for you to get information from them. Ask them what they're seeing in the market, which places are hiring, what roles are they seeing? A lot of demand for, etc. Never hurts to establish a relationship, assuming they aren't an annoying recruiter, that is going to pester you. And if you do establish a relationship with such a recruiter, you can send them your resume and give them an open mandate to search for a role for you, or have you in mind when one comes across that fits your criteria.
I have a bunch of other thoughts. Happy to chat or hop on a call if you're looking for some feedback (no, I'm not a recruiter). My email is in my profile.