Now, I ain't much of a poet but I know somebody once told me to seize the moment and don't squander it
Eminem is talking about himself — or rather his old self.
In the video for the song, he reenacts the Lose Yourself video, where he raps about seizing the moment.
The message here might be that he’s going back to his old self (without the drugs, of course) — or rather his old ways of rapping.
He’s stated in various interviews that after he got clean he forgot how to rap, and how to write songs.
He’s been slowly getting back on the horse, and he believes he’s back to his old self.
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