Price your goods properly. You are running a business!
If you have paid for Folksy Plus already, then you have nothing to lose by listing, as there will be no extra cost. If you haven’t, then perhaps you’d want to choose a selection of items to begin with…
Take (& edit) the absolute best photos you can manage and give several views of your products - maybe also of the making process (where it doesn’t give away any “secrets”). It’s worth using a good photo editing software and a decent camera (which doesn’t always mean expensive).
Make sure you fill in the information about your shop and a bit about yourself, your making process etc. Have a good banner and avatar.
Make it as clear as you can, with your photos, product description and information about your materials and proces, that you are a professional and your items are Quality. If you can think of things to put in the Inspiration section of each listing, that will support your product and description, all the better - whatever will show that you offer a high quality, well-made product, using good materials.
Of course, all that will only result in sales, if you can get people to view your shop and products - that’s another issue altogether!
Good luck - your bunting looks nice (though some photos could be a bit lighter/ brighter). This is my favourite: https://folksy.com/items/6573924-Upcycled-doiley-bunting-vintage-doiley-banner-bohemian-bunting