I haven't actually read any of Marie Kondo's writings, but I've read about her approach to household organization and decluttering.
One takeaway was that things should spark joy. It's with this in mind that I attacked my jewelry rack. I thought realistically about when I last wore a piece, or how often I wore it ... and then I imagined someone spotting it at Goodwill and it making her happy. If a thing no longer brings me joy, why shouldn't it brighten someone else's world? With that in mind, I'm parting with 13 pairs of earrings, one necklace and three rings.
Even better, when I look at what I've got, it's easier for me to decide what to wear.
I know what you're thinking: DUH!
OK, so it takes me a while.