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Setup more than one account on gcloud , thanks to google this is a peace of cake
$ gcloud config configurations create config-name
Created [demo-config].
Activated [demo-config].
$ gcloud config set project my-project-id
Updated property [core/project].
$ gcloud config set account my-account@example.com
Updated property [core/account].
$ gcloud config set compute/region us-east1
Updated property [compute/region].
$ gcloud config set compute/zone us-east1-b
Updated property [compute/zone].
after that you need to login
gcloud auth login
Done you create a new config config-name
Now to swith between accounts just run
gcloud config configurations activate config-name