Earplugs: Those silicone flanged ones are way nicer than the foam, _and_ you can get "musicians" ones that have a fairly uniform dB cut across the audio spectrum. Going to a concert, you can still hear the way the music should sound, just 20 or 30 dB quieter, so your ears aren't ringing after, but you still get to feel the bass thumping your chest.
Sigh. All the efforts in my 20s to preserve hearing, and then around 30, ISSHL more or less took out my right ear. Well, positive way to look at it is at least the other ear has as good sensitivity as possible for my age. "prep"/survival-wise, it does make me nervous not being able to locate sounds very well. If they're really loud, the other ear will pick up, which leads to the weird effect of passing cars (on the wrong side) "switching" sides of my head when they get close enough.
My electronics preparedness effort for April is to go through my large collection of power banks and run a discharge(self discharge check)/charge-discharge(capacity) test/80% charge (or maybe 100% then discharge 10-20% if I don't catch it). One old one started out fine, but after a cycle started swelling a bit. When opened, I didn't see any spicy-pillow look to the LiPo, but I discharged it down to millivolts through a 10 ohm resistor and recycled it. One 18650 based one was down to like 70%. Not bad, but I have enough no need to keep a worn out one, esp. since it's one of the old 5V 1A units. I'm thinking of giving away anything that tests good that doesn't have USB-C output, much less ones that can't deliver 5V 2A USB-A.
I also still have some flashlights with "original" 18650s... from back when CR123 was the standard and 18650s were the hot new thing. Two old ones tested fine for capacity (1800 and 2000mAh) and charge retention, but IR was up to 200-250mohms (yeah the MC3000 test isn't trustworthy, but it can tell 50 from 200). Not sure what to do with ones like that. Flashlight duty, on high, is clearly not so good, and just from age, I should probably get them out of the house.