I cannot see any items you have sold, or selling, but have you taken advantage of the under £10 and 100 gms which allows simple postage to be ignored. It all depends really on finding the correct category/sub category.
I have virtually given up on ebay, unless prepared to pay for promotions NOT FREE TO SELL, then ebay has a severe case if rigor mortis. The buyer protection scam can virtually double prices even when avoiding simple postage, and at the end buyers are getting no more than they previously got for free.
Over the last 20+ years ebay have had a lot of fees off me, but no more.
https://www.ebay.co.uk/help/selling/posting-items/setting-postage-options/simple-delivery?id=5575
Scroll right to the bottom for opt out, only parts of the categories appear to work.
