Why acme.sh doesn't support Letsencrypt.org CA ????
Why don't you ask them, and why did you open a topic with such a dishonest title? Because I'm pretty sure it does, even if it now defaults to ZeroSSL. And the reason that it defaults to ZeroSSL is that ZeroSSL owns acme.sh.
You might be looking for this thread?
Thanks, and I have already updated one wildcard cert with certbot )