GCP - How to Add a Role
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Go to the Google Cloud Console.
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Navigate to IAM.
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Click on "IAM & Admin" in the left navigation menu.
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Select "IAM" from the submenu.

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Find your service account.
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In the IAM permissions list, locate your existing service account.
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Click the edit (pencil) icon next to your service account. (Please delete the prior custom role that we create before proceeding)

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In the edit permissions panel that opens, click "ADD ANOTHER ROLE".

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Paste each role in the filter tab, and then select from the dropdown menu:
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Pub/Sub Editor
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Cloud Asset Viewer
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Browser
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Security Reviewer
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Viewer
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Logs Viewer
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Monitoring Viewer
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Compute Viewer

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After adding each role, click "ADD ANOTHER ROLE" to add the next one
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When all roles are added, click "SAVE"

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Verify the roles
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After saving, the service account should display all the newly added roles in the IAM permissions list.