Just been to look at your shop and your items are gorgeous. I agree with others about the use of tags - I picked my 3 favourite items from your shop and none of them had tags. Also definitely put the word silver or hallmarked silver in your titles so they are picked up in the search.
You say you haven’t listed anything new in a while which could be another problem as I believe Folksy searches favour more recently listed items. If you have nothing new to show maybe it would be worth relisting a few of your items as completely new items, I know that has disadvantages regarding previous favourites being lost and any links in gift guide etc but it might be worth thinking about.
Try joining in some of the promotion threads here on the forums and maybe join instagram, craft juice and twitter if you haven’t already. Also Facebook has a facility to put a “Shop Now” button on your page which you can link to your folksy shop. Good luck.