Thank you for the reply and advice.
Tried it but it did not take effect.
Did more searching and found out that the following needed to be done.
bench setup supervisor
sudo supervisorctl reread
sudo supervisorctl update
After that the supervisor.conf is updated and it takes effect.
Here is the link.
https://discuss.frappe.io/t/how-to-increase-number-of-gunicorns-workers/13648/3