Is it worth something ?

I built an e-commerce software for the clothing shop of a friend. I don't know if it's worth trying to sell it to others:

it's an e-commerce management software. You only manage your inventory and it updates both the POS (for physical sales) and the e-commerce website at the same time

current functionnalities:

Simple stock management (ins, outs, orders and backorders)
Simple POS for physical sales (with ticket printing and card payment link)
Stripe and paypal integration for online payments
that's it. I'll try and see if it's worth something to someone.

the shop is https://likesports.eu
It is currently running on prestashop but i plan to change it to a custom node server

current landing page is lame: https://insomniak-software.web.app/

So I am just wondering if i should build a better landing page and try to get subscribers or something (i'm good at coding but i suck at marketing)

What do you guys think?