Cooperation isn’t pulled; it’s invited. People support what they help create, and resist what is imposed on them.
So stop selling and start consulting. Ask for suggestions. Ask what they would do in your position. Ask how they think the problem should be handled. Then listen.
When the other person contributes, they become invested. The idea stops feeling like your demand and starts feeling like a shared plan. That changes energy immediately.
Be willing to adjust. If you ask for input and ignore it, you create cynicism. If you accept part of their suggestion, you prove the collaboration is real.
If you want cooperation, protect autonomy. Make the other person feel like a partner, not a pawn. Pride can block action; pride can also power it. Use it wisely.