Laravel, React application getting rejection!

We have a Sales, Purchase, and Product management software which we built using Laravel Backend API, React Frontend, and MySQL database.

We have implemented docker for easy installation. Our backend API code is well documented and in the root directory of the Backend API, there is a well-documented Swagger Documentation also. We have also written a step-by-step Installation Guide for Windows and Linux. Also a Detailed Quick Start Guide.

Here is the backend API link: http://lfix.us:8002/
Here is the Frontend Application: http://saleflow.truckvara.io/

But it gets Hard rejection without any explanation. We are unable to figure out why they rejected it and found no solution anywhere (FAQa and Forum).

They send us email writing this:

Thank you for your submission. We have completed our review of “SaleFlow - Streamline your Sales and Purchases with Acounting Management” and unfortunately we found it isn’t at the quality standard required to move forward, and you won’t be able to re-submit this item again.

We have invested more than 3 months and 3 developers on this software. We have a kind of Same software in the Nodejs-React-PostgreSQL stack which got 100+ sales.
Link: ERP OS - ERP, POS, Inventory, Invoice Software by omegasolution | CodeCanyon

But our Laravel Version Software is more updated and has more advanced features with UI/UX enhancements.

Please, suggest us what should we do now and what could be improved. :disappointed:

Thank you in Advance.