The best way for a business analyst to help the team work together more effectively is to lead them in creating a team agreement that assigns project roles and outlines how the team will collaborate, disagree, develop trust, and define success. This will help them align on common goals, expectations, and norms, and resolve any conflicts or misunderstandings. Encouraging leadership to share their vision for the project and ask the larger team to focus feedback only on the key objectives, pain points, and requirements outlined by leaders may create a top-down approach that ignores other stakeholder perspectives or needs. Limiting participation in key project discovery, requirements, and solutioning meetings to leadership and engaging the larger team to answer questions directly related to their roles when needed may create a siloed approach that reduces collaboration or buy-in. References:
https://trailhead.salesforce.com/content/learn/modules/salesforce-business-analyst-certification-prep/collaboratio

Explanation
The mistake made in capturing these acceptance criteria was that they include solution information instead of focusing on what needs to be achieved by implementing this feature or functionality. For example, specifying that "a service manager can click a Reassign button" implies a particular design choice rather than describing what outcome should be achieved by reassigning cases (such as transferring ownership or notifying new owners). Acceptance criteria should be aligned with the user's goal rather than prescribing how to achieve it so that they do not limit creativity or innovation in finding solutions. Acceptance criteria should also be small and testable so that they can be easily verified by using techniques such as scenarios or test cases. References: 1
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-certification-prep/user-sto

The business analyst should use the output from the Salesforce Optimizer tool to identify top project priorities.
Salesforce Optimizer is a tool that analyzes a Salesforce org and provides recommendations and best practices for improving performance, security, usability, and maintenance. Salesforce Optimizer generates a report that highlights any issues or risks in the org, such as unused fields, inactive users, complex sharing rules, etc., as well as suggests actions for resolving them. The business analyst should use the output from the Salesforce Optimizer tool to identify top project priorities by reviewing the report and ranking or ordering the issues or risks based on their impact, urgency, dependency, or value. The business analyst should also communicate and align with the stakeholders on the project priorities and scope. References:
https://help.salesforce.com/s/articleView?id=sf.optimizer.htm&type=5