I wonder if it's a matter of targeting the right phrases for search. I have no idea about your category, and I have done none of the keyword research, so my advice is not worth much, but when I look at this listing:
https://www.etsy.com/listing/180570085/long-butterfly-necklace-initial-charm?ref=teams_postAnd start to search for the phrases in your title (long butterfly necklace, shades of purple, embossed brass pendant, art deco style, personalized jewelry), it seems like you're missing some of the key combinations. None of those phrases (as separated by commas) are suggested searches except "personalized jewelry" - and it has a gazillion results, you should never count on it alone as a source of traffic. There's no suggested search for "embossed brass" at all, and while "brass pendant necklace" is a suggested search, you don't appear because you don't have necklace after it.
"Long butterfly necklace" is not a suggested search, but "personalized butterfly necklace" is - why not have that as the beginning of the title? Your necklace belongs at the top of that search.
Anyway, I'd look again at suggested searches to see if you're missing some key phrases that people actually use to look for things like yours.
But if you've already done all this research and I'm off base, apologies! I don't know your category as well as you, for sure.