Sadly my contest didn't harness any interest [...]
If there's enough positive feedback regarding this idea, I'll open up a more structured post about it in this section of the forum and officially launch the event.

Dear friend, I would suggest you to not abandon such a nice idea after a first failure. Perhaps Helena was right, and setting a minimum number of participants prevented some to join. I am not sure. But you should try again, at least once

I'll tell you a story: I have a
merit giveaway thread in Romanian section, which I used to open during winter holidays, asking users only to show how they celebrate Christmas or a picture showing a humanitarian action done by them and I would reward all participants with merits! I launched the topic on each winter, from 2019 to 2022. Guess what happened?
Nobody participated in all four winters!What I'm trying to say is that I did not abandon the idea after first winter, when nobody participated. Nor the second time, nor the third... Eventually I locked the topic after winter of 2022. Therefore I am encouraging you to try once again. If there will be no participants this time either, then maybe reconsider the idea. But I believe that, with some
fine tuning the contest will work now

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I also agree with Helena's suggestions from below:
I would suggest you should run the contest regardless how many participants joined. Let's say only 9 members join, it's not fun if the contest will not be valid and no one will win.
Another suggestion you should offer the prize able to convert to Bitcoin, some people who have high privacy don't want to get collectible.
The whole theme was very similar to the pumpking carving contest
You may want to delete a "g" (not a G spot

) from "pumpking".