To further drive my point home, let's go see how creativechain's site is rated. 

https://sitechecker.pro/seo-report/https://www.creativechain.org/project/

0/100. 17 warnings, 9 of them "critical". Not only is your site ranking abysmally for SEO, but also accessibility, and the site points out the same thing that I did - You are using H1 tags incorrectly, in fact, you have two of them. Google Page Speed Score is: 36/100. This is the most comprehensive SEO rating tool that I can find. The other may give you a better score based solely on the fact that they don't check a fraction of what sitechecker does. So I don't really care what your designers with years of experience think when they can't even use an H1 tag properly or assign alt descriptions to images.