So there's nothing for me to fall back on, I know no other trade

from Eminem (Ft. Liz Rodrigues) – Survival Lyrics on Rap Genius

Meaning

Eminem is continuing the theme from the previous line and stating that rap is the only thing he is good at.

Rap is the only thing Em’s bad to the bone at!

He knows no other trades (crafts), a term he will use in its second meaning in the next bar.

Em says in previous song Rain Man, this is the only thing that he’s good at

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