Hi Mark,
I'm really sorry to hear that you're not getting the results you want from Etsy. It's horrid when it feels like it's just not working. I've been having a look at your shop too, and the main things that can both draw in a customer, and put them off, are product photography, and postage costs.
Considering this, I thought it might be helpful for me to me to do a short critique of one item in your shop, and I chose this one...
https://www.etsy.com/listing/204228232/water-colour-card-hand-painted?ref=shop_home_active_9So, first of all, your postage costs are really low, which is great! I can see that you charge £1 postage to the UK, and only £1.50 to the USA, which is super low! As Sarah says above, overseas sales will probably become your bread and butter here on Etsy. I certainly sell a lot to the states and Australia, so postage costs here are relevant and important, and you seem to be getting this right.
Secondly - photography. I think you could improve in this area, without a huge amount of work. With the listing above, the painting is obviously really very detailed and has a lot of refined work in it, but we just can't see this from the photograph! If you have a look in my shop, you can see how my photographs are very close up, and I've done this to show the detail in the design.
The trick with photography is plenty of NATURAL light. My photos are taken on a white background (a piece of A£ white foam from my local art store), next to my office window, with my phone camera! I kid you not! This is a handy article from the Etsy blog that you might find useful...
https://blog.etsy.com/en/2010/etsys-guide-to-photography/I actually really like the idea of a combination of staged photographs and detailed close up ones for your items.
I don't know if I've been helpful, but I know that you could be really successful on Etsy, and want to help you as much as possible to get there!
Charlotte xx