I used to be a build-a-tower kinda guy and I'd only replace a component when it wasn't pulling its weight, but after 2012 I downsized where I was living and went strictly laptop due to the lack of room. Unfortunately that makes it somewhat hard to upgrade, but it does mean it's worth spending the time investigating what the options are.
2012 I went for a MacBook Pro - it was grunty enough to run then-AAA titles, and do the builds for iOS that I was doing at the time, 2016 I finally moved off to an MSI gaming laptop, and in 2021 another iteration of MSI gaming laptop.
But as for other electronics I don't need? That's a tougher question. There is a part of me that would love to have a Raspberry Pi, or an Arduino, but I have no uses for these, nothing I want to build or assemble. Meanwhile the current gen of new gaming devices, whether it's the Steam Deck or the Playdate... I'm curious, intrigued even - but I can't justify it. That makes it fairly easy!
That said... I did get in on the Kickstarter for the second-gen ZX Next. I have no use for one, but there's a part of it that harkens back to my childhood and a simpler time - I never had a C64, I was a ZX Spectrum kid, and part of me wants to go back there but with slightly less in the way of rose-tinted glasses.