Cannot access WHM and SSH on Centos 7

I wanted to install gitlab on my server and after performing the commands they have provided in my SSH, now none of the sites on my server is responding. Here is the commands I have used: sudo yum install -y curl policycoreutils-python openssh-server perl sudo systemctl enable sshd sudo systemctl start sshd sudo firewall-cmd --permanent --add-service=http sudo firewall-cmd --permanent --add-service=https sudo systemctl reload firewalld
So now I cannot access to WHM or SSH anymore and the only thing I can connect with it to my server is iDRAC. So Im wondering how to fix this matter.