Mi website is un accesible after update of ssl certificates

No. In fact the Cloudflare rules that I recommend for Let's Encrypt compatibility will not function if the Cloudflare Proxy is disabled.

My recommended configuration exempts the .well-known/acme-challenge path from HTTPS redirection., insuring that it arrives at the origin server on port 80 as expexted. The Cloudflare SSL/TLS::Edge Certificates::Always Use HTTPS option prevents that override from working. You can probably still redirect HTTP to HTTPS in your Cloudflare configuration by using a specific rule with a lower priority then the exemption used for the challenge path. I handle my HTTPS redirection at my origin, so I don't have any tested guidance for that.

I have moved my exemption configuration from a single Page Rule to separate Cache Rules and Configuration Rules.

Cache Rules:

ACME Challenge
(starts_with(http.request.uri.path, "/.well-known/acme-challenge/"))
Cache status: Bypass cache

Configuration Rules:

ACME Challenge
(starts_with(http.request.uri.path, "/.well-known/acme-challenge/"))
Automatic HTTPS Rewrites: Off
Browser Integrity Check: Off
Opportunistic Encryption: Off
Security Level Essentially Off
SSL: Off