Every time I got the urge to hit Leetcode and start interviewing for a new gig with a 50% pay increase, I remember 2007-2009 and getting laid off from 3 different companies as the economy imploded. And it's hard to remember now, but things never really felt truly safe, even with in-demand tech skills, until 2016 or so, when suddenly recruiter email started really exploding with competitive offers.
Watching the market cool down leads me to believe we're going into another downturn, and I'm becoming more confident I made a good bet by not jumping ship in the last year or two.