OP I don't know anything about your type of products but I will say that your postage looks a little high to me.

Are sellers of similar items using free post or lower post costs? Are the others sellers doing things different to you and making higher sales?

Take some time to examine what others are doing and see what is bringing in sales and what is not.

ebay is a very dynamic marketplace and what worked 12 months, or even 2 months ago, may not work today. You need to stay alert to any changes in customer expectations and be willing to change to suit.

Good luck 🙂