Hi there
I have reviewed your requirement for best UIX for existing WordPress website, I am best fit for this. I am having 5.3 years of experience with WordPress website design & development with custom design or theme integration, WordPress plugin development, WordPress E-Commerce store development, Payment gateway integration and booking portals etc.
Also having experience of websites with fully custom, back-end theme, developed from scratch, the theme has feature like Avada | Divi theme to create and manage slider anywhere on the website.
Contacting me here can be more easier to describe about my understanding, Let's chat here or other way of your communication, I will be available as per your convenience time.
Thanks for reading my proposal.
Regards.