We just hit 1000 unique visitors after 3 days.

There's some data that shows that having a form (or some other "time sink") on your landing page can help with conversions (as it makes the user invest).

Still, I would definitely add some more information about the "what" and "why".

Overall, the current form is super clean & professional looking, I really like the style!

Maybe you can get some inspiration from https://gumroad.com/

Just added another visitor 😀

It seems like a great idea. But I’m not converting, it would be great to show why your solution is better than many alternatives out there.

In looking at it I get the idea quickly - you are an instant solution to selling files, it's on me to market them, etc. But I am short on some info I need to make a decision. Right off the bat here is what I want to see - what does the URL look like that I get to sell my stuff - explain that I get one, I get my own page, this is the link I give out, and what it looks like.

Second thing - show me an example of what my page will look like, how much room do I have to showcase and explain, can I add images? How much text space? What does it look like on mobile?

You have log in but not sign up - I have to give you my file before anything - Add a sign-up button before I give you my files because I don't know you. You might regret the no-sign-up benefit if what's sold is sketchy. I don't see how sign-up is a drawback here or how that's too much friction and has become your secondary USP after "sell anything in seconds" - You know the space better than I do most likely but "sell anything in seconds" should be enough of a draw.

The website shows upload, customize, notifications, payment, share - show me each of these - that's the tour - that's the point at which I have enough info to make a decision.

Maybe break explainer sections into blocks separated by testimonials (when you get some), end with a sign-up CTA button. It can still be simple and clean but you have to explain and build trust.