Earlier quoted context omitted.
It has gotten to the point where I'm seriously considering just working from home every day, even though that's strictly not allowed. Open-plan offices are absolutely maddening, I get pulled out of my thoughts constantly, and there's no effective way to shut it out. Earplugs aren't enough, and with headphones I would have to play music so loudly it would be annoying my colleagues, just in order to cut out the constan…
You might try earplugs and earmuffs at the same time. It's a pretty effective level of sound isolation.
I've also tried earphones with music, but I can't work like that for long, I just start listening to the music instead. I need peace and quiet.
And of course there's the issue of visual noise as well.