What I failed to mention is not only about the stuff you own, but in general your relationship with material possessions.
Before selling everything, I’d constantly worry about whether I should get a third monitor, maybe try a curved one, get a new keyboard, upgrade the TV, get a new kitchen appliance, replace the sofa, etc. There’s always “newer and better” for everything.
Nowadays, I don’t care anymore. I bought a TV because we like watching movies, but I don’t care about the technology or the next shiny thing. Same with my computer, I work on a 14” laptop for the past two years, and I no longer feel like I should chase a better or newer setup.