I just took a quick look at your site and can tell you why your SEO guy said the title and descriptions were ok. You’re using one header for the whole site and changing that will take some work.
My advice it to place all the content pages in a database with their own unique title and description and have the header call the database for that info when it calls for the page.
Also target some less competitive keywords.
And get rid of that security cert. It’s annoying.
Other than that you have a beautiful, well laid out site. A little work and you’ll begin to get more traffic.