I think that this song is trying to make love and breakups more of a light topic. It says "I miss you, but I miss sparkling," likely referencing a relationship or breakup (potentially with Joe Alwyn, her last known ex boyfriend) that she finally realized wasn't good for her or she was better without. If this is correct, she is using the word "bejeweled" as a way to say she is still doing well, especially when she says "best believe I'm still bejeweled when I walk in the room, I can still make the whole place shimmer"
Hopefully this helps someone and please note that this is all just speculation about the songs and their meanings.
Also please be nice to both Taylor and Joe about their breakup. We can't know for sure if this song is about that, but no matter what, neither of them deserve to get bothered about their personal/love lives.
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