Art V is for purposes of proposing Amendments, ie changing the Constitution.
Yet changing it via constitutional means; so in a sense, enforcing it.
The Framers were well aware that times and circumstances would require modification of our founding document, so stipulated the process by which such modification can be done — Article V.
Alexander Hamilton, in Federalist 85, has a well-tempered and rather cautionary view of the matter:
The zeal for attempts to amend ... must abate in every man who is ready to accede to the truth of the following observations of [David Hume, Essays]: "To balance a large state or society ... whether monarchical or republican, on general laws, is a work of so great difficulty that no human genius, however comprehensive, is able, by the mere dint of reason and reflection, to effect it. The judgments of many must unite in the work; EXPERIENCE must guide their labor; TIME must bring it to perfection, and the FEELING of inconveniences must correct the mistakes which they inevitably fall into in their first trials and experiments." These judicious reflections contain a lesson of moderation to all the sincere lovers of the Union, and ought to put them upon their guard against hazarding anarchy, civil war, a perpetual alienation of the States from each other, and perhaps the military despotism of a victorious demagogue, in the pursuit of what they are not likely to obtain, but from TIME and EXPERIENCE.