The first thing to do is to determine the reasons why you're thinking about the need to update the site.
If your current website is outdated and does not allow your business to grow online, the results of the behavioral factors audit can be a great help in designing the interface of the new site, and we will do a usability audit at the stage of creating the terms of reference for the new site.
If your business has not "outgrown" your current site, and the decision whether to create a new one or to modify the current one a little bit - the usability audit will help to understand which variant will be more acceptable for the solution of your business problems.
As a result of the study we will certainly understand what exactly needs to be improved on the current site in order to make it more selling. Or confirm the need for radical changes and creating a new website "from scratch".
Leave your contacts, so our manager can contact you and analyze the input data on the project and determine in what direction it's better to move.