You are in a Very competitive market.
If I put in a general Pokemon cards into search, just under 5 million appear!
With so many to choose from, buyers are going to use Best Match >> Lowest price first.
Your items are showing, but it's your prices which will not attract views.
For example, I just checked a few cards, this one Charmeleon Reverse Holo , you have for £2.99, I found the same card for £1.09 your card will never sell , if peeps can find the identical for nearly 50% less.
All I can suggest, is to check out prices others are selling identical cards for, beat them even by 50p a £1, make yours more attractive to buyers, and I'm sure you'll then find some buyers.
@cruzor