I don’t quite buy into the idea that in any field whatsoever, after a few years, you’re unemployable. In leadership positions, the competition is certainly tough, and the risk of that is high. In the IT sector, technology also advances at a completely different pace.
But then, for example, in a machine shop, they weld the same steel as before, and the standards or manufacturing methods haven’t significantly changed in a few years, or even a decade, at all. If you understand the methods, can read drawings, and lead people, then you can certainly do the same at some level later on.
Or as a project manager in almost any industry, no one who truly understands things is interested in whether you know the latest trending acronyms for different methods on a theoretical level, if, as a counterbalance, you can present merits from successfully completed projects. Not every seasoned professional masters these, but they are paid for the fact that, if necessary, they can hold more than just a pencil in their hand, and their life experience is sufficient to handle even the most challenging situations. The biggest challenge is to prove that it’s not about a prolonged drinking spree, but a genuinely voluntary step away from working life.
And if you’re not returning to working life with completely empty pockets, what you lose during your absence, you can offer yourself as an additional resource and handle invoicing, perhaps as a sole proprietorship, when bureaucracy isn’t bothering your mind. As these additional resources are needed on an irregularly regular basis in industry, depending a bit on the cycle. You also sometimes see those leadership-level people working in roles like project manager/marketing manager/procurement manager/sales manager/salesperson.
Of course, if one is not willing to start a notch or two lower and be flexible in the beginning anyway, then perhaps returning to work is almost impossible.