The title sets up a joke: a commencement speech is where graduates expect to be told to chase greatness, and this one says the opposite. The speaker suggests that maybe we should aim to be average, and then lists what that would free us from: competing with neighbors and coworkers, being faster and more efficient, and wanting more and more money. The spelling "wealthie$$$t" makes that hunger look almost absurd, as if the word itself is swelling with greed.
What the speaker wants is simple: to feel okay where you are, to leave work at five, and to stop caring for the rest of the day. The tone is relaxed, a little wry, and quietly tired of the pressure to keep climbing. The last line, "To abide rather than win," sums it up. To abide is to stay put and endure calmly, and the poem presents that as a kind of peace rather than a failure.