It's hard man. I don't know if anyone here can realistically give you useful advice or much comfort because if you've been employable for years and are only now struggling it suggests it's not you, but that the job market has changed.
The job market for developers is really bad right now, and honestly it's hard for me to see it improving much any time soon. The industry is so saturated with talent these days that I can't imagine there ever being the same kind of demand that we've seen in the past.
Really all you can do is keep applying and try your best to understand where your limitations are. I think web development is particularly bad right now because the web development ecosystem is very accessible so there's a lot of talent concentrating there. When I got into web development you had to first learn how to configure a webserver and set up DNS, etc. Today you can just spin up a website with a single command. You can create a basic React website in an afternoon.
I guess what I'm saying is that I don't think you should try to compete in web development skills. Instead you should try to compete by highlighting other skills that complement your experience. For example, do you have experience with accessibility? Do you have experience with any devops tools? Do you have experience leading teams? These things can set you apart from all of the other profiles which say "webdeveloper with 10 years experience".