I suggest you use the “Pause Cloudflare on Site” option from the Overview tab for your domain at dash.cloudflare.com. The link is in the lower right corner of that page. Give it five minutes to take effect, then make sure site is working as expected with HTTPS. Only then should you un-pause Cloudflare and double-check your SSL/TLS setting to make sure it’s Full (Strict).
This is a hosting issue. You’ll have to get that working before you can proxy it with Cloudflare. It’s quite possible that’s not even the correct IP address for your website, but a lookup of that IP address belongs to Nazwa.