I am trying to set up Red Hat OpenShift GitOps in my sandbox environment. However, I am unable to find the OperatorHub under the "Operator" section in the OpenShift console.
You must be logged in with a cluster admin account to be able to install operators. If you only see the installed operators section, you are probably using a user account.
Then you won't be able to install extra operators. If I remember correctly, you only have access to OpenShift Pipelines and OpenShift Serverless which are preinstalled.
Maybe you could install your own ArgoCD instance (not using the OpenShift GitOps operator), but I don't know if you'd have enough resources.