Well, you should only be using HTTPS nowadays if you're caring about SEO so much and also about the website & data security and privacy of your users. Everything should be loaded via HTTPS including Javascript, CSS, images and every other resource. Don't use HTTP. TLS certificates even with wildcards are free nowadays with Let's Encrypt.
I don't only mean that you should use HTTPS on your site only and redirect all HTTP requests to HTTPS but you should fix all resources that are loading from HTTP. The test you showed said there are so many and so many of these and that files that are loaded over HTTP (14 javascript files and 8 stylesheets). You need to find the URLs of these resources and change their protocol to HTTPS. Most are pretty much linked in the theme and plugin files.
Also I would recommend to do what @
LightDestory recommended. Combine things together or minify them in order to decrease the overall amount of requests on your page and the page size. This will improve the loading speed, performance and your SEO score.
Off the topic rant:
I don't really understand how people can use themes and plugins that are heavily bloated. I mean what the heck???? 14 javascripts and 8 stylesheets. What? What do you need? Usually you only need one stylesheet for the theme style and probably JQuery + custom Javascript for theme functions. This are 3 - 5 resources but NOT 22. And people also wonder about their site getting hacked... welcome Javascript cross injections with so many scripts that are maintained by who? People don't even realize that most themes or plugins hardcode URLs to ONLY certain version of Javascripts by using the version string... this means if that Javascript version has security issues... they're never fixed because no one changes the link to the next version with the fixed code.
That's one reason why I stopped using Wordpress and similar stuff. Nothing nowadays is made properly. Everyone wants/uses bloated and super fency stuff but no one pays attention to what this does to their site, security and data integrity.