No, it has to be “for a reason.”
WHY should you “make America Great Again?” If they don’t understand through education why that’s a good thing-—and they won’t-—then you better find a better argument as to NOW why making America great again is a GOOD thing, how it benefits therm.
Okay, that's like asking "why make Chinese great again." If you don't understand the language, and can't tell one squiggle from another, then why care if Chinese is a great language or not.
If I accept the supposition that the high-knowledge answer of appealing to American Exceptionalism, the Great Experiment, individualism, self-reliance and consent of the governed is beyond the ken of your target millennial, then the low-knowledge answer becomes this:
You live here in America, not somewhere else.
Tell them:
Don't be fooled by socialism's promise to care for you. Look around you... the Democrats aren't promising to care for YOU, they are promising all the foreigners of the world that YOU will care for THEM, that YOUR children will care for THEIR children.
Ask them: Is THAT what you want? Is THAT what you signed up for?
Making America great again is good for YOU because it will pay you for YOUR resources, teach and employ YOUR child, put food on YOUR table, heat YOUR house, fix YOUR roads, care for YOUR needs first, and take away THEIR power to starve you by cutting you off from the things you need to survive.
-PJ