There is not, because that icon is not exclusively for letting people follow your site. That icon is to open the site’s widget area, which will show any and all widgets you add on your site.
There’s nothing on your site to follow, though. You only have a single post published, and that post was published in September last year. All the other content on your site are pages, and followers do not get notifications when you publish new pages, only when you publish new posts.
Once you have at least two published posts on your site you will also get a follow button in the bottom-right corner of the site, and that is always visible to all visitors on your page.