Ocsp.int-x3.letsencrypt.org is not working in China

The error in your latest screenshot is not fatal. It occurs when Certbot is checking whether the certificate is revoked, but if it times out, renewal will still proceed anyway.

You can see below the error that “all renewals succeeded”.

As for why OCSP is timing out, could you please run this from your server also:

host ocsp.int-x3.letsencrypt.org
host whoami.akamai.net