Pls see my initial problem with installing the subdomain via below link
After I successfully installed SSL for the subdomain (blockchain.dcwebmakers.com) two months ago, now I can not not renew it. I did run renew command and it renews all of my domain except this one.
CN=blockchain.dcwebmakers.com
02.10.2019
31.12.2019
expires in 90 days blockchain.dcwebmakers.com - 1 entry
so the restart was the missing step.
Why do you want to remove a valid certificate? That's always wrong. Use it 60 - 85 days.
Then check your cron job protocol why it didn't work.
Please: Never remove / delete / revoke valid certificates (if there is no problem with the private key). There is a rate limit. And it's completely unrelevant if you create a new certificate via cron job or via a manual command.