Having a lot of views and fewer sales is normal, and happens everywhere.
Your product has been public for 3 days, and it already has a sale .. that’s incredible! If you don’t have an established fanbase, earning sales is something that happens slowly over time.
I’m not sure what your experience is with publishing, but a good rule of thumb is, for every project out there with a thousand downloads, there are a thousand projects with 1 download.
Over time, establish a fanbase, be vocal on social media about your work, and it will become easier to get new projects to more eyes out there.