Building my first product (and finishing it)

Hi fellow hackers!

I was introduce to the community more then 1.5 years ago and tried to build some small products but always gave into despair and self doubt.
Always starting but never finished anything (pretty typical to a lot of devs :P)

A week ago I got a boost of motivation and decided to build (and finish for the first time) a product.

The initial idea was to create a holiday promotion automation app for shopify. For that, i needed a some holiday API.
The options iv'e found we're expansive or unfitting so i've decided to create one myself.

No big hopes but I did learn a bunch about what it takes to create everything alone like FE, BE, deployment, buying domains, connecting payments etc etc etc. My goal is to create products for the next year and see where it takes me.

The holiday api - https://freeholidayapi.com
You most honest opinions are welcome:)