You need to create and start a new customer journey to send "Welcome" emails to...

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1. Create a trigger-based journey that triggers on changes to the contoso_clienttier field.

Since the "Welcome" email should be sent when an account first enters any client tier, a trigger-based journey is required. The trigger should activate when the contoso_clienttier field is updated with a value.

2. Select the frequency as a one-time journey where newly added members can start at any time.

A one-time journey with newly added members ensures that each new primary contact will enter the journey when their account first gets assigned a tier.

3. Add the journey steps.

After defining the journey type and trigger, the necessary email steps (sending the "Welcome" email) must be added before publishing.