I thought this might be helpful, some advice provided to me today by an ebay chat staff member:

"Though eBay do not have any fix steps which can help you to boost your sales, but as a customer support and fellow seller I can help you with few generic steps below which may help you to boost your sales. 1. List new items every day 2. Try an eBay promoted listings campaign 3. Use keywords to attract views 4. Ship fast and free (whenever possible) 5. Remove negative reviews (You can Join us here on chat for the same) 6. Offer a generous return policy 7. Share your listing on social media 8. Sell at the right price 9. Maintain great seller ratings 10. Include enough high-quality images per product 11. Provide great customer service 12. Write clear descriptions etc"