Here is a list of high-profile platforms to local directories that allow you to list your website for free (at the time of writing). These websites cover a range of audiences.
You submit your website’s URL, as well as additional information about your business or organization. These sites, in turn, incorporate your info to their data banks, ensuring that your link is there when users are searching your content categories.
In addition to direct display of your content, adding your links to these directories improves your site’s Search Engine Optimization, gradually improving your website’s ranking on search results.
One tip: It might look overwhelming to you to list your website in all of these directories and it surely takes some time to do this. Why not list your website in one or two (our clients are already listed in "Google My Business" and then see how your SEO improves.
Please note that some of these directories are international.