Would PHP and Ruby still fit this? Not just the "boring" part but also the long shelf life? These have been my main standbys but a lot of things in the web are moving away from them. Should I jump back to things I haven't used in a long time? I don't know how much Magento has changed over the years but I get some recruiter emails about it, even 8 years after I last used it on the job.
Ruby on Rails is still well and alive (see Ruby 3.0, and the recent mimemagic issue), overall I think PHP is more widely deployed (and alive, see the recent malicious commits to PHP. worth exploiting like that = people use it and update it). As brundolf said, Wordpress is everywhere.
You could go off the one you prefer more, but I'd definitely recommend reaching out to contacts and just casually surveying if they know what places use what to give you an idea of your local situation.
It helps that the culture/mentality is different from the start, but if you work for FAANG-like places or start-ups, it probably not hugely better. Vice versa, I'm sure you could find a more laid-back workplace in the US, might just be a bit rarer. To be honest, I've seen some coasters in FAANG-type places, too. The bigger the place, the more opportunity there is to slip through the cracks, but it's a risk. On the opposite end, in a smaller place your expertise goes further, so you might be able to get away with putting in less effort day-to-day. Plus fewer meetings.
In any case, and as other commenters have mentioned, the easiest path is to pick "boring" technology that still super valuable to the business, with a long shelf-life, but not sexy. You become proficient in it, maybe you already, don't mind working with it, and you're set.
There's still the tricky part of making it future-proof, but a lot of technology sticks around longer than you'd expect.