Go to a local music shop and look for musician’s earplugs with a rated dB reduction. At least -8dB, but a bigger reduction won’t make your experience worse, it’ll just make things even quieter.

I have some from a major guitar manufacturer that I’ve been using at the infrequent shows I go to for a decade. They were $10 then, and it looks like that’s still true. I clean after using, but I wasn’t really expecting to get this many shows out of them.

They don’t muffle sounds, it just sounds quieter. Without earplugs I need to stand on the other side of the room/field to be comfortable. I’ll still leave with ear pain and feeling exhausted. With earplugs I’m comfortable right in front of the speaker stack, and leave feeling exhilarated.

They’ve been a huge upgrade in my enjoyment of shows and I’m very grateful to my friend for dragging me to the shop and making me buy them.