That is the dirty little secret of our industry. You need to do your day job AND on your own time, keep your skills up to date, and/or work on open source and/or write a blog or something. There was a post on there the other day on how keeping up to date with k8s is a full-time job in and of itself, well you need to do that - and a bunch of others - in your free time, in the full knowledge that what's hot today might turn out to be worthless in a year or two.
People on the outside, even those aspiring to get in, I don't think fully realize the commitment of those making the headline salaries in this field. Just as you won't make it as a banker unless you LOVE making deals, so much that you'd even do it for free...