While you're responsible for leading the team, it doesn't always have to be your solution. Sure, your solution might be the best one, but is it significantly better than the one the team generated? If there's only a marginal difference, try letting the team run with theirs. They'll be more excited about it, learn more effectively from where their plan had shortcomings and be more invested in the outcome, which should lead to better execution and higher engagement.
Reconsider your role in the problem solving process and move from problem-solver-in-chief to being the enabler of your team building, executing and learning from their own solutions.
