itch.io

Im not a genius of prizing but normally the most sold 2D game assets (sprites) dashboards for 9-15 USD tend to have enough content to do an entire game with them or be close to it.

On the other hand yours have 30 sprites with different sizes and no animations Im not saying it's bad with some extra sprites you could perfecly make a board game with this but ceartinly here 90% of the people who is searching for game assets want to make a videogame where you are able to move where you want, sadly for this purposes its clearly not enough and you dont have the reputation to go across this and get some people to buy it just because you made it or so I think.

So my recomendation is or to spit the pack and make each one cheaper in order to make people want to buy both (9 USD) when buying one (be carefull with this small packs are easy to steal)

or to look for other prize that attracts the people (by watching other's prizes) 

or to go to another shop where the traffic is more interested in cool static images (Etsy,Creative Market, Redbubble, Gumroad, Society6 (quick recomendations by chatgpt)).

To leave it clear im not an expert maybe saying "its kinda expensive" was rude (I apologize if it was) or this is rude or im overthinking and going crazy so hard but well its my opinion.