But even as the backend is nice i think there is a big room for improvement in the front-end, i don't have android so i've checked the your website and the screenshots of your app.

Your icons are too big, the interface looks something like from middle 90's with lot's of tables and rectangular shapes. Your "call" button is a lot different fom the rest of the UI. It's clear for me that it is not your area of expertise so it's really fine actually. The main problem for this is for your users, the first thing they will see is the UI and not much the backend and the features you built, so for a product it's nice to have a nice UI for it to become successful.

If you have money you can try to hire some designers to help you (at least freelancers) Ben awad is a youtuber/developer who is also creating an app and one things you can see from his journey is that he hired designers with his co-founder to help make the app beautiful (https://www.youtube.com/watch?v=ViYUp7jsJNM)

If you still need some inspiration and tools: - You can try Figma for designing and prototyping, it's free. - Dribbble for inspiration - Freecodecamp for courses and tutorial on UI/UX design.

I think this is what you will probably need. Besides that, it looks nice and really promising, just need some polishing.