User scenarios can help you optimize your SaaS product onboarding by aiding the design of a smooth, intuitive user journey that guides users from sign-up to activation. To do so, you need to map out the user journey based on your user scenarios, identify the key moments and actions that demonstrate product value, and design an onboarding experience that supports users in completing those key moments and actions. This onboarding experience should include clear instructions, tips, feedback, gamification, personalization, social proof, analytics tools, and feedback tools to measure and improve the experience. For example, for an email marketing tool, the user journey could be: visit website, sign up for free trial, create account, set up profile, import contacts, create and send welcome email, see results and feedback. The key moments and actions would be: sign up for free trial, create and send welcome email, see results and feedback.