Hi I'm new to Etsy and learning myself but have had a shop critique done for me and have a few initial thoughts:
As your items are one of a kind use OOAK, Unique, Limited Edition etc in title/tags
You repeat 'earring' a lot in your tags - you only need to use it once. This means you can get other words in also, eg; gift for her, mom, Unique etc etc.
Etsy is moving toward easy to read titles rather than stuffing them with words, yours look good to me.
It is recommended to repeat some of the title main keywords/phrases in the first lines of your description. So, for the item https://www.etsy.com/uk/listing/576174138/hammered-copper-earrings-with-silver?ref=shop_home_active_1 The description could read 'This pair of Hammered copper earrings with silver beads make a real statement........'
You know more about your jewellery than I do! However I am not sure that 'minimalist' is a good fit with boho, ethnic, eclectic - it does not really chime with the brand. The items in the 'minimalist' section do not fit with my idea of minimalist either, for me it is stark with clean lines. I may be wrong of course, but just my twopence worth.
Check out Kara Buntin on you tube for good - and UP TO DATE info re SEO etc. There is so much old info out there.
All the best - and good luck to both of us!!