What is the name of the domain?
What is the issue you’re encountering
The DNS propagation process is taking more than 36 hours. How long would it take as my hosting is expiring soon?
What feature, service or problem is this related to?
DNS records
Alrady using below Cloudflare nameservers:
paul.ns.cloudflare.com
megan.ns.cloudflare.com
DNS propagated, furthermore, if you recently changed your domain nameservers, regular DNS propagation time usually takes up to 24-48 hours to complete.
You might not see the Website and it might not resolve to you due to the local DNS cache at your machine, router or local ISP.
May I ask have you tried using a different Web browser, or tried clearing your Web browser cache?
How about using a Private window (Incognito mode) or a VPN connection if possible?
Is it the same behaviour on your mobile phone (4G LTE, mobile data, cellular)?
Looks like 525 SSL issue to me at first sight 
Cross-check and pay the invoice so you don’t loose your web content.
Furthermore, regarding the SSL 525 error, might be the connection between Cloudflare and your server detected some issue such as the SSL certificate at your origin host/server for your domain expired, therefrom Cloudflare tries to establish a connection over HTTPS and 443 port, but cannot.
Possibly, if you’ve left SSL/TLS on “Automatic”; it might detect and switched to Flexible but now you might be experiencing issues such as mixed content errors and cannot determine how to proceed further.
Go here to do that, https://dash.cloudflare.com/?to=/:account/:zone/ssl-tls/configuration. Select Custom and not automatic. Reference, Introducing Automatic SSL/TLS: securing and simplifying origin connectivity
Otherwise, it switched to Full (not strict) to still have room so your origin Let’s Encrypt SSL certificate could still try to validate and renew (if Always Use HTTPS is disabled).
Have you checekd your CF dashboard under the SSL/TLS settings, did it switched to Flexible or not?
May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?
Before moving to Cloudflare, was your Website working over HTTPS connection?
Best way is to temporary Pause Cloudflare for your site. Wait few minutes. Double-check the origin SSL certificate. Renew it. After the Website works okay over HTTPS, un-pause and all good.
Steps for troubleshooting:
- 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 without any error
- Check with your hosting provider / Plesk panel / cPanel AutoSSL / Let’s Encrypt / ACME / Certbot and manually click to renew it
- Only then, when your website responds over HTTPS, you should un-pause Cloudflare and double-check your SSL/TLS setting to make sure it’s set to Full (Strict).
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