“The Raspberry Pi 4 Heatsink should be that thing you should get to prolong the life of your RPi4. This heatsing is however of the dimesions that it's a really really tight fit. It also only attaches to the CPU, which means the chipset which sits a bit lower loses a thermal path and receives a thermal buffer instead.
As an afterthought - I would have gone with a multi-piece heatsink kit like the one for the RPi3.”
