Somewhat impulsively, I accomplished two things I've been procrastinating on for months:

• Upgraded my main PC from 16 to 64 GiB RAM. As neat SFX PCs are, a trivial upgrade like that required taking half of it apart, including the CPU cooler to get to the RAM slots.
• Added a shim to my main monitor arm to raise it by about 5cm. It gave me a bit more clearance to store junk under it, and also a lot more comfortable level to look at it while leaning back.