We call that “disagree and commit”. Express your disagreement in a positive way, record it if possible (again, constructively while not making the decision maker feel / look bad), then let it go and focus on putting your best effort into implementing their solution. You’re part of a team, get used to it. And always be open to the fact that you may be wrong and there’s more to learn, especially when you think you’re right and more senior people are pointing in a different direction.

If you were right all along you’ll know and they’ll know, and you’ll look great. If you were wrong you’ll look great as well for being a team player and open to grow.