“provide for the ...general Welfare of the United States”
After that, the Constitution goes on to enumerate powers for the federal government. Those powers are enumerated to “promote the general welfare”. The Preamble is not a grant of power. That slippery slope has caused a lot of harm. It’s the reason the federal government literally pays women to have children out of wedlock. Let’s not try to wield that particular ring of power for our own ends.
The preamble, in this instance, ties specifically to an enumberated power of Congress in Art I, Sect 8:
Under the enumerated powers granted to Congress is this: “provide for the ...general Welfare of the United States”.
1st sentence, iirc.