This is a short list of usability recommendations how to improve current weak points on an old version of website in the new one. Let’s start from home page and first screen.
All recommendations have statistical justifications from the Google Analytics.
The first suggestion was based on Nielsen Norman Group research
Carousels allow multiple pieces of content to occupy a single, coveted space. This shows a lot of information, but on large or small viewports, people often scroll/ignore carousels.
A static hero or integrating content in the UI may be better solutions. But if a carousel is your hero, good navigation and content can help make it effective.