The items on your eBay page doesn't really attract people much. Honestly it seems like a lot of meh.
There's nothing unique. You can buy most of these items in a store, our any online retailer. Your diaper samples are mostly diapers no one wants or can get significantly cheaper anywhere else. You're novelty items seem like cheap Chinese made items that are found everywhere and will fall apart.
Your cloth diapers should be packaged with inserts especially since they require them for use.
I don't know what you have to spend, inventory space you have, our anything like that, but you have to think outside of the box. What do we not have. How about modern cloth diapers that have more of a functional use.
To jump in the printed diaper market you'd have to make a splash. You have to offer a good product at an attractive price.
How about modern toddler like AB clothing? Larger baby printed blankets?
Think outside of the niche products we have already, and improve your choices for sure