In such a situation, ask for their take when making certain decisions that they may be informed on, and practice active listening by letting them speak and you do the listening. Always get them involved in small and major decisions related to the project, and avoid making changes after informing them. Value your clients and fill them in, always.

I'd say start with clarifying the message and amplifying is necessary. Guidance: Help your client articulate their key points with clarity and confidence. Focus on structuring their message to be concise, data-driven, and aligned with the project’s objectives. E.g., Encourage them to use a framework like “What, Why, and How”—e.g., “Here’s what we need to achieve, why it matters, and how I propose we move forward.” This increases the likelihood that their contributions resonate.