My cloudflare ssl is active and working and active but website is not secure

Recently, I hosted a Wordpress website and added SSL through Cloudflare. Now my website shows not secure when added https. I don’t understand what happened and what to do now. Someone suggested me to flush my DNS, clear cache and history of my browser and try again but still the problem remains the same. Please help…

This picture shows when I add https to my domain name. It shows me some kinda internal ssl error
When I open my website with http it opens but shows website is not secure.

My website was working normal till morning and afternoon but after i was adding some functionality to my wordpress website using feedburner and this hapened. I dont this happened due to that functionality or some other reason

Need help…

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