Issue in adding Practices

I added 4 Practices Linux, Ansible, Docker and Git. I then tried to Kubernetes but it gave me active Practice limit error. When I removed Ansible and tried to add Kubernetes it still gave me limit error. Then I tried to swap Git with Kubernetes it once again gave me limit error and removed Git as well from my practice so ultimately now I have only two active practices.

Can someone tell me how to fix this so that I am able to add more practices?

Ok, Thanks! I went through the documentation!

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