I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn't work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I'd gladly replace if it broke.
I have KDEConnect, but I'm in a weird situation where my desktop and phone are on different networks. Desktop is on Ethernet, and phone is on Wifi. Can't afford a wireless adapter for my desktop at the moment. I got Debian with KDE last month, so I'm really looking forward to using it whenever I move out.