Many institutional problems are not really persuasion problems. They are legitimacy problems. People may agree something needs to change but disagree about who has the right to decide, whether the process is fair, whether the evidence is trusted, or whether the people leading the work understand the consequences.
I can help you think about how legitimacy is built in practice: through participation, transparency, competence, sequencing, evidence, consultation, ownership and visible fairness.
This matters in government, but also in communities, movements, organisations, civic projects and any environment where formal authority is weak or contested.