So I picked myself off the ground and fucking swam 'fore I drowned

from Eminem (Ft. Kobe) – Talkin' 2 Myself Lyrics on Rap Genius

Meaning

Em realized that he was at the bottom of his game, the bottom of his rap career. He had to swim to the surface: to shine in the game once again.

He’s saying that he’d try his very best before he’d actually drown and be forced to leave the rap game.

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