Hello, Good day. Thanks for your minimalist but clear project description.
Yes, I have looked up your website and I seen, a DigiCert SSL certificate by Cloudflare is already installed on your site/server. But your site is still not secured, because of MIXED CONTENT issue.
Do you want me to re-install another SSL certificate or fix issues for the current one? I can do both for you, no problem. I'm experienced with SSL installation and error fixing related to SSL.
Let's have a talk.
Thank you.