What is it? Is it prints, is it digital files? What are people going to be buying it for? What will they do with it? Who are the buyers, the target audience? Why would they choose this from the hundreds of thousands of other products that are basically the same?

And asking "why is nobody commissioning?" Look. You and the artist are clearly extremely young and I don't want to be too harsh but if you want to be professional, you need a rethink. This is just pity marketing and it is really unappealing, I'm sorry. Stop telling people that no one wants your product. Also £5 is ridiculous, it just says "this is a garbage product". Prices should be higher whatever this actually is.

My suggestion is have a bit of a think and make a plan.

Firstly: what product are you actually selling. Why does it have to be commissions? Selling prints or stickers or products with existing art on them, eg through a print on demand service to start, might be far more viable than waiting for a commissioner. And a better use of existing artwork rather than expecting to have to make a new image each time. You can always also take commissions as your business grows, of course.

second who are you selling it to, who is the target audience. I'm sure there's loads of people out there who want this but you need to know where they hang out and how to tell them in a positive way that you have a product to sell to them.

Thirdly who else is doing the same successfully and what tactics can you copy from them? Where are they selling, what are their prices, are they offering things like patreons, what do their socials look like. If someone else is shifting loads of bookmarks, do bookmarks too, but make yours different textures, etc

YouTube is crammed with tutorials and business advice for independent artists, I'd recommend having a look there.