Your most recent certificate was issued by ZeroSSL - not Lets Encrypt. You were using Lets Encrypt before August but those expired. You can see in your debug log that the server used is acme.zerossl.com
I think you may have been affected by a change to acme.sh in early August.
By the author of acme.sh, see:
Renewal problems with Zerossl should be sent to their forum or acme.sh github (links in above link).
Or, reissue your cert with Lets Encrypt following the instructions in above link (--server letsencrypt).