Sorry for the wrong information @ansarul,
you created this file inside the /etc/lego certificates, I didn't notice that before. You can check its content by running this command
sudo cat /etc/lego/renew-certificates.sh
It should contain the renew command of all your domains. You can run it by running this command
sudo /etc/lego/renew-certificates.sh
You will need to change the crontab's file to use that file (substitute the /opt/bitnami/letsencrypt path with the /etc/lego one)
sudo crontab -e
Happy to help!
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