Rejuvenating my 2012 MacBook Air.
I don't really use it much anymore though, but this was the very first laptop I bought with my own money that I earned from work, and also my very first personal Mac. I used it for many years too.
Now maybe I use it occasionally in bed if I'm working on scripts or some documents, but otherwise, I use my PC and the work MacBook Pro and Mac mini for everything else.
One lesson learnt though - thermal paste makes a huge difference. It "cakes" and dries up over time, so it is actually a good practice to clean up every few years. Will be doing the same for some other components soon.