Get people involved in decisions while presenting the idea to them. Create places, when talking about the idea where they can make some choices that contribute to the final plan. Only offer choices when you can be happy with their decision. This is not about setting them up or about manipulation. It is about co-creating an idea.
People are less likely to reject something they have been a party to creating.
Move rocks, not mountains. Suggest ways to get started. Small steps require less trust in the unknown and less risk for the listener. If this works, then we ll move onto that. Suggest a test period or trial of some sort.