Change the look, feel and structure of my whitelabelled Agency

I have a whitelabelled Agency which acts as an all-in-one CRM, CMS and Automations hub. A screenshot of its dashboard is provided as a screenshot under the name Smarty.

Due to the fact this is a whitelabel, any other person who has a whitelabel of this product also will see the exact same design. We want to differentiate ourselves and ideally change our UI/UX such that it is no longer clear at all that we are a whitelabel to anyone that might know the SaaS, rather I wish for it to look unique.

We can achieve this because the SaaS allows us to insert our own custom HTML, CSS, and JS.

This project has two major requirements/expectations:

One: I wish for you to help propose different UI's/different design choices we can go for, so we are on the same page with how the final version will look. This may include changing/customising how information is presented currently on the page.

Two: I wish then for you to complete the programming required to achieve this new look. *Very Important*: I require the programming done to be very well documented and also not dependant on each other, so if I hope to change aspects of it it will not break the whole site, and it would be obvious what each section of code does.