Yeah, if you join a good seo team, they will be able to help you find great key words.
This team was good.
https://www.etsy.com/teams/11352/relevancy-and-seo-for-all-etsy-shops/discuss/Another trick I use is that I'll search Etsy for tags I want to use. If there's millions on millions of that item, I won't use it cause I don't want to get lost in the sauce. So I'll try to get a little more specific with my tags, but not so specific that I'll use tags that no one will ever search. So find a happy medium, not too broad and not too specific.
For instance, on this item. I would try, Wrist Lanyard, Multicolor keychain, fishtail keychain, keychain for teens. cloth keychain. thread keychain.
https://www.etsy.com/listing/235369130/multicolor-fishtail-braid-wrist?ref=shop_home_active_20You'll also want to have your tags match your titles as well. This helps in the SEO process.