How do I sell my first product?

Hello, I'm Uğur, I woke up at 03:00 a few days ago. I tried to sleep in bed for 2 hours. But I couldn't sleep. Then the idea of selling a simple PHP login system I made for myself came to mind. The codes were already ready. I just needed to clean it up a bit.

It was cold and there was no heater in my room. My fingers were cold on the bed. Maybe that's why I woke up. Maybe god woke me up to develop this product. Then I asked myself a question. I would be cold in bed. Or on the table. Which one? I woke up by choosing the 2nd option and designed everything until the morning with my hot tea.

I made mistakes in all the emails I sent because I was sleep-deprived. I thought I could earn $2 with 20% off my $6 product. This demoralized me.

A few days later, I wrote on Medium: https://medium.com/@phpcode/how-to-use-bootstrap-templates-in-3-items-fa8c8e8da614

Then I searched myself on Gumroad Discover and couldn't find it. Turns out, it's required to sell for at least $10 to be featured on Gumroad Discover. I gave myself a star with a side account for marketing purposes. It didn't work. Gumroad was smarter. :)

How do you think I can get my first sale in a short time?

My Product: https://phpcode.gumroad.com/l/php-login-system