Roast my idea: simple e-commerce with built-in loyalty

Hello everyone :)
How are you all doing?

Have been looking for something to develop as I'm working remotely now, meaning I have much more free time than before. Started developing a loyalty program, but it was too simple (one point per purchase) and not very interesting (IMO. Didn't validate it beforehand), so I gave up.

However, I noticed that a lot of people (at least here, in Brazil) are creating e-commerces. Don't know much about the success rate of those businesses, but I do know that they could be more sucessful if they had a well-designed loyalty program (something I know how to do). Also, most of them are using Wix, which has a poor UX and is overly complex, at least for the kind of audience I'm targeting.

What I want to do is an "e-commerce factory". The sign up flow would be as simple as Instagram, and the store would be located at "myproductname.com/yourusername" or something similar.

The customer should be able to customize the theme, upload their logo and also configure the loyalty program. Adding products should be as easy as creating posts on Instagram (yeah, their UX is great, really great. Even my grandma is using it).

Initially, I want to start with only one dynamic layout. By "dynamic", I mean that the layout is capable of adapting to its content, i.e. if an user flags some products as "new", a big carousel component will be rendered showing them at the top of the page, so it will be the first thing a customer will see when visiting the store. If the user add products to categories, then the categories will be rendered and maybe a search bar too to help filtering the list.

The integrated loyalty program can be enabled or disabled by the user. Also, like I said, it can be customized too. I won't talk about it otherwise my post would be larger than it already is.

My plan is to sell the product as the simplest, fastest and most effective solution to start a new e-commerce for small (1~5 people or so) businesses and doesn't have (yet) a huge monthly income.

Share with me your honest opinion about this idea, please.

Thank you.