Looking for Low Cost UI/UX Designer Desktop and Mobile Both

The UI of my ready-to-use Multi-Vendor Marketplace Script build under Laravel looks very "simple".

The Script in question was bought on Codecanyon with Genuine Licence and comes with its own Flutter Mobile Apps.

I am looking for a LOW COST Designer who can design an eye-catching and impressive User Interface, exchange ideas for a fast and concrete project completion, work in a coordinated manner, and provide flexibility in revision.

I want to restyle the complete appearance, buttons, menus, fonts, icons, forms, Admin, Customer and Sellers panels, create a Logo, add custom Banners and Pictures.

All customizations made in the Web Side, precisely to the Main Site, Admin Panel, Seller Panel, User Panel, and in the Mobile Side precisely Seller, User and Delivery Man Apps (IOS/Android both) must be equal between them and error free.

In Web Based Side we have :

1. Frontend Website
2. Admin Panel
3. Seller Panel
4. User Panel is visible in Frontend after "Sign-in"

In Mobile Side we have :

5. User App (Android + IOS both)
6. Seller App (Android + IOS both)
7. Delivery Man App (Android + IOS both)